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Liquid Pump - 350GPH (12v)

Do you have some liquids that you need to move? This fluid pump will move 350 gallons per hour! The SEAFLO mini water pump has a heavy duty 12V, 1.5Amp motor and a tough thermoplastic body. It's totally submersible and water-cooled (but it won't burn out if run dry). Use this pump to make a fountain or waterfall, even water your plants!

The 3/4" connection will accept a 19mm ID hose. It comes pre-terminated with heavy gauge unterminated 3ft long wire leads.

  • 12V operation
  • 350 GPH
  • 1.5A motor
  • 3/4" barbed outlet
  • 3ft long wire leads

Liquid Pump - 350GPH (12v) Product Help and Resources

1 of 1 found this helpful:

Dimensions of Liquid Pump

The dimensions of the Liquid Pump:


Another tech had measured the dimensions of the pump:

Blue base diameter = 61.23 mm

Red top diameter = 57.82mm

Height = 107.78mm

Output tube diameter = 20.14mm

Output tube height at tallest point = 29.03

Output tube height at shortest point = 21.09mm

Core Skill: Robotics

This skill concerns mechanical and robotics knowledge. You may need to know how mechanical parts interact, how motors work, or how to use motor drivers and controllers.

1 Robotics

Skill Level: Noob - You will be required to put together a robotics kit. Necessary parts are included and steps will be easy to follow. You also might encounter basic robotics components like bearings, mounts, or other hardware and need a general idea of how it goes together.
See all skill levels

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
See all skill levels


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Can it work at 7V?

  • Is it strong enough to be used as a UAV propellant?

  • What is it's total measurements in ft. size ?

  • What gauge wiring does this have?

  • It should be noted that this is a common marine "Bilge-Pump" (Get the water out of your boat in a hurry). Internally it's just a centrifugal impeller disc on a shaft(as basic as it gets). While pumps of this type have large flow rates and easily about 3 or 4 feet of Head, they will not produce any useful pressure over 1 or 2 PSI. Not only are they submersible, but they MUST be submerged to operate, as the inlet is the blue vented plastic piece at the bottom (this piece is meant to be removed, screwed to the bottom of the bilge and re-attached). They will happily run dry for hours with no noticeable negative effects, They are not actively water cooled, and any cooling on the water's part is merely radiant heat from the plastic case. The motor itself is completely sealed off in the plastic body save for the shaft with the impeller disc on it.
    The more you know!

    • Hi there Danvm, thanks for this, I'm glad to learn that it doesn't have a "conventional" hose inlet before I bought one - I need a pump which can be inserted into a pipe rather than suck from a pool...

      Taking it off my Wish List now!

  • 350 gallons per hour? For a drinking robot? Cripes, you must be so thirsty! (And surely you'd call your robot 'Bender'?)
    Let's see... if you divide by 4.55 and carry the 2... That's a bit over 22 litres per minute.
    With beer at 4.8% alc/vol, you'd need to run this for about 25 seconds to get DUI!!!

    • You want to divide by 3.78 as these probably aren't imperial gallons. It'll get you a few extra seconds of driving time.

    • "get DUI", as in get drunk enough you aren't allowed to drive anymore? So do you really need to drink 9.2 liters of beer for that? Just how BIG are you? :)

  • Any chance we could get dimensions for this? It's kind of hard to tell from the photos.

    • It is 108mm tall and has a 70mm diameter. In standard units, that's 4.25" tall by 2.75" in diameter. Aka "tiny little thang".

  • Perfect for an ROV thruster!

  • next gen super soaker!!!!

  • Very cool product to carry! I've been using similar boat bilge pumps on projects for a couple of years now. Uses include, solar powered garden fountains/streams, using rain water for irrigation (you've got to get the captured water out of the cistern somehow).
    Under constant use ~8-12 hours a day the pumps don't last forever (6 months is good depending on quality).
    You need to sell a simple low-side MOSFET breakout with the 1 Amp diode to control these with the PWM from your Arduino/MCU.

  • I bought this to build a little shower pump for my kids baths (to save water). The PSI is really low so I can't even bring the shower head attachment more than 1 foot above the water before it can't pump anymore.

  • Is it reversible?... the flow can go in and out??.....

  • Cool Hack with this pump http://www.homebuiltrovs.com/howtobilgeconversion.html

  • Does anyone have any idea what valves would work with this pump, since the solenoid valves on Sparkfun apparently aren't compatible?

    I found these, but really don't have much experience with flow control systems:

  • I have one of these at home, but I'm at school right now and can't look at it, so does anyone know how tall this is?

  • This pump is great. I tested it in my sink and it really worked.

  • Hi. Is this pump FDA regulated for drinkable liquids. For example, is it safe to have this device pump water that I then drink.

  • When this pump is turned off, will it allow water to reverse flow back into a reservoir via gravity? For example, if this is used to pump water into a container higher than the pump and fluid reservoir, will it allow any fluid pumped into the container to drain back into the reservoir once powered off?

    • Most likely it won't hold the pressure, however, adding a check-valve to the outlet is trivial.

  • What are the dimensions for this tank? And also is it possible to water cool electronics like laptops with this? I'be tried every other cooling pad out there but they just don't do the trick.

    • This is not a tank, it's a bilge pump designed to be immersed in water, which it sucks through holes and ejects through a hose. For liquid-cooling electronics, you probably want a sealed pump with a hose inlet and an outlet.

  • How can I confirm that the motor is running in the correct direction. I'm not sure whether HIGH or LOW is the correct setting for my motor controller and the motor instructions imply that the only difference is that one direction should give better performance than the other. I would guess that the motor should move anti-clockwise when looking at the blades, ie that the edge closest to the spindle is the leading edge and the outermost part of the blade is the trailing edge. Thus the water is sucked in the middle and thrust to the outer edges.

    • Yes, if you're looking at the bottom inlet, the impeller should be spinning counter clockwise for most efficient operation.

  • " It comes pre-terminated with heavy gauge unterminated 3ft long wire leads."

    pre-terminated with unterminated. lol

  • would this work with thicker fluids, like tempera paint?

    • Inside is basically a propeller (impeller). It will likely pump thicker fluids to a point, but with decreasing pressure and lift. If you're hoping to squirt paint like a fire hose, I don't think this will do that.

      • thanks, i just need to pump thinned down paints to a nozzle that will drip on a canvas. i may just use gravity + solenoid valve.

  • Not sure if anyone mentioned this, but these are very useful if you want to build your own ROVs (pretty much remotely operated unmanned submarines)

  • Can the pump be operated continuously (24hour a day) ? Or is it meant to operate for a short period of time ?

    • It can operate continuously. The motor brushes and seal will eventually wear out; in fountains I've had these run for a couple of years before needing replacement.

  • Does anybody know.... say I pump some potable water through this, will the water still be drinkable when it comes out? Basically, on it it's yourney through the pump, does it encounter anything that I wouldn't want to be drinking? Thot i'd just check

    • Unless the pump is already filthy from pumping something nasty, you shouldn't have a problem. This pump is not advertised as being "food safe", but it's just plastic and a small amount of stainless steel and rubber for the impeller shaft. I would personally have no qualms about using it for drinking water.

  • It have a 1.5A motor, so does it draws 1.5A ? If i have a power supply that is supplying 12V and 3A am i giving it too much current ?

    • Current doesn't work that way. If you're supplying it with the rated voltage (12V), it will only use as much current as it's rated (1.5A) and no more. A 3A supply is perfect!

  • How big is this thing?

  • Anyone know the dimensions of this pump?

  • Any idea when this will be back in stock???

  • How high can this pump lift water to? Anyone tried? I am thinking about building a auto top-off system for my aquarium. hope you guys can help

    • I didn't measure it, but when I tried it on 12V, it could reach a head of maybe a meter. This is a high-volume, low-pressure pump.

  • what are the temperature ratings of this? if i ran it in hot water it wouldn't cool itself as well, but would it run all the way up to 100 deg C?

  • I just. Ordered six of these for an rov project that im doing and i was wondering if the impeller blade was removed would i be able to reverse the motor.

  • This looks like a good pump, but can this pump handle 60 degrees celsius water? Or a very sturdy substance. I am thinking of using this for a 3D printer to circulate hot water or pump the matrial out.

    • All we can say for sure about this pump is that it's designed to pump fresh or salt water at normal ocean or lake temperatures. It may work for other materials and temperatures, but it's up to you to find that out. Let us know what you find!

  • Does it work with the PWM? Is there a method make it suck less? I need it for making a greenhouse and it "works too much"

    • Yes, you can use PWM or drop the voltage to reduce the flow. I've used a LM317 voltage regulator to do this, but note that the 317 will get hot so this isn't the most efficient solution.

  • Does anyone have an idea of what additional parts (part numbers would be ideal) would be required to hook this up to an Aruino? I just want to make a very simple project to water the garden from a rain barrel.

    • You could also use an N channel mosfet or relay! Both are available on this site

    • You will need a motor driver. This one will work if you are using only one of these pumps (< 2 amps). Then, buy some headers, hookup wire and make sure you have a 12V DC power supply. The motor driver page has a link to example code that is easy to mod to fit any need.

  • Couple of questions:

    Can this unit be used to power a ROV? Ie has this enough thrust to push something forward/down? How deep can this unit go? 10m or beyond would be perfect.

    • I don't know about the depth limits, but up at the top of the comments baum mentioned they saw an ROV at the Rochester Science Museum propelled by 4 similar pumps. Though we don't have details on how big this ROV was or how deep it went. However, at just under $15 per pump it's probably worthwhile to order one and do some testing to see if it'll provide the desired performance. That's what I'd do...shrug

      • The motor in this pump is a 12V brushed motor, spinning in a sealed air-filled cavity. There is a rubber seal on the motor shaft that keeps water out within reason, but at some depth water will overpower the seal, which will cause the motor to fail. These pumps are popular for ROVs at swimming-pool depths (they produce quite a bit of thrust!), but this isn't what they were designed for so I wouldn't count on them running indefinitely. They aren't too expensive, so you could always swap them out when they fail.

  • Can I use this for fluids other than water? (it does says "fluid pump" but then is called "mini water pump"

    1. wine
    2. vinegar
    3. oil (olive oil)
    4. fuel (gasoline)

    If yes for all of these.. will I have to take care of additional cooling?


    • While you can use this for fluids other than fresh or salt water (its original use is as a bilge pump), note that this is not rated for food-safe or flammable uses (for gasoline or other fuel you really want something "explosion proof", which this isn't). It can probably handle thicker fluids at reduced flow, but we haven't tested that. Thicker fluids would make it run hotter, but there's not much you can do to provide additional cooling. Also note that this is not an inline pump - you need to submerge it in the fluid you want to pump and it will suck it in through a grate in the bottom.

  • Terrible instruction manual. After a flash I learned that this device requires direct current. Any advice on how to get this thing open to replace the fuse?

    • Sorry about the confusion, but everything we sell that doesn't plug into a wall runs on DC, so by convention we leave off the "DC" or "AC" on our voltage specs. Unfortunately, these aren't designed to be repaired; they're designed to be cheap and replaced as a unit when they wear out. The casing is permanently sealed to make them waterproof, so to open it you'll need to cut it apart, and somehow re-seal it if you can get it working again. It sounds like the motor is blown (it's the only part in there; there is no fuse), in which case the easiest thing to do is replace the entire unit.

  • Where did folks pick up the 19mm ID hose?

  • What would be a good power supply (based off of some sort of battery) to run this for about 3 hours?

  • Could we get a pump curve for this pump?

  • What is the lifting capability of this pump? Can it lift up to 6 feet? Inquiring minds want to know.

    • Just read "12V Solenoid Valve -3/4" details. It says:
      ".... It operates at a minimum of around 3 PSI, ..... Our 350 GPH pump does not have enough pressure for this valve."
      So max lifting 6 feet or less.

  • Does anyone have the dimensions of this? OD" x L" or a spec sheet?

  • To make an ROV thruster, all you have to do is remove the impeller, and attach a model-boat propeller to the shaft. I trimmed some of the plastic off to make it more streamlined.

  • What sort of head (suction on inlet) can it draw, or is it submersion only? Also a rough pressure/flow curve diagram would be helpful. I am interested for a small fountain application. Thanks!

  • Think I could force water through this pump and use it as a turbine to produce electricity?

  • Would this pump be an acceptable option for powering one shower head or kitchen sprayer apparatus? I'm designing a mobile shower and am looking for a 12v pump for this.

    • It could possibly work. You might not get the desired pressure depending on where you would locate it in respect to the shower head and the filter on it wouldn't be the best if your plans include recycling the water.

  • Anyone, is it possible to reduce flow rate of this pump to say 50GPH in any way?

    • You can run it at reduced voltage for reduced output. That's what I do with my solar fountains, as these are capable of throwing a LOT of water when hooked up to a larger (15W) panel.

    This is funny. Yesterday I got an active icing system for medical applications. Fill an igloo like cooler with ice water and it uses EXACTLY this pump to pump the water through a bladder on the extremity you wish to ice.
    It's worth mentioning that it died within 15 hours, but I have to say that it REALLY just seemed like a defective unit. It is QUIET and really does a great job. Were the manufacturer not sending a replacement Saturday overnight, I would buy one to replace it. First time I ever saw one was yesterday... Now it's here.

  • Can these be interfaced with an Arduino?

    • Yes, but you'll need the right transistor/mosfet, arduino can't handle more as 5 volt/~30mA per pin.

  • YAY never again will i have to supercharge a crappy aquarium pump.

  • Having used what seems to be an identical pump, I can vouch for the overall lifespan on these units. I have lifted heated saline up to 28-36" for 3-4 hours at a time. These pumps are also resistant to damage from running dry or running at low water levels. (They do make entertaining noises when they chug and gurgle)

  • Can you post a video of it working, to get a visual idea of how much 350GPH? I need one of these, but I don't want to buy something not powerful enough for my application.

  • Does this have an adjustable flow rate?

  • What kind of noise does this pump make?
    b) Noisy little bugger!
    c) What? I can't hear a thing!
    Seriously, is it something that would be a bad idea for a quiet fountain indoors? Would it totally mask the sweet burbling sound of a small indoor water-fall? Or is it completely quiet?

    • Having used similar pumps, very quiet when it's under water. Makes a great sucking/slurping sound when the water level is low. I have made many fountains and it does not overshadow the sound of the fountain. At full power these will easily push about 3' of head. Check out the video for an idea of what size fountain to run.
      I'll put my solar fountain controller board up on Batch PCB if anyone's interested.

  • What is the rated 'lift' of this pump? It would be hard to design this into a system without knowing that information. For instance, if it's only rated for 6 inches (yeah, that's an extremely small number for sure), then the position of the pump would be critical. If it were rated for 14 feet, then it wouldn't matter unless your pumping liquids to another floor.

    • @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@



  • Yay! This is certainly the right direction for things, but I'd still love a smaller pump too! I really think that so many people out there have wanted to make a drink robot, but sourcing the right pump is too difficult! I've seen some on alibaba but thats hard for regular people to deal with.
    However I agree with others that this would make a great ROV thruster!

    • Evilmad scientist.com made a drink bot a while ago using breast pump (new of course) as a cheap source for food-safe pumps.

    • Oh heck yes. I'd love to find the valves and pumps for drink robot that wouldn't cost an arm and a leg.. that money would be better spent on better booze for the robot to dispense... I'd hate to build one knowing that all I can afford to stock it with is 'Bankers Club'...

    • Agreed and agreed!

  • Q: If I hooked this up to a faucet or spray nozzle, do I need to turn it off if the water isn't running through?
    I would love to use something like this for a portable sink basin but a lot of pumps say they'll burn out (but then again they also state not to run them dry).

    • It says right in the description "it won't bun out if you run it dry".
      Then again, I suspect it would shorten its life if you just left it running all the time.

      • Running dry is not the same thing as the OP. Running dry means having it move air, which has orders of magnitude lower viscosity and therefore represents considerably less load on the motor than standing water.

      • I should clarify, I mean having it on, but the nozzle turned off. Water would be going through the line, but not "traveling" through. It would only be for short (10-15 seconds) duration until I flipped off the switch (or a pressure sensor tells it to turn off). Thanks!

        • Depending on how powerful and well built the motor is you may have two possible issues while the water is not allowed to flow. One would be cavitation around the impeller if the impeller fits closely to the case and doesn't let much water free flow around it which would cause damage to the impeller and case. Second would be a spike of current draw by the motor, again if water isn't allowed to flow the motor is going to try to work harder, get hotter and use more power. I don't know if this would be a problem but it is something to think about when setting up your project.

      • yes, I think the idea is that because it is an impeller pump there's no excessive friction when you run it dry (as in a piston pump) But because the motor is water-cooled, I would imagine that running it dry wide open for long periods would shorten it's useful life.

        • Add a liquid level sensor so you don't run it dry.
          I use these and they work great as switch inputs to your MCU.
          product FLT016
          SparkFun should carry these, or similar, too.

        • yeah. piston pumps REALLY don't like to be run dry. I assume this one isn't thrilled about it, but it's much safer to do so with a impeller design.

Customer Reviews

3.2 out of 5

Based on 5 ratings:

Currently viewing all customer reviews.

3 of 3 found this helpful:

Seems to have a reasonable amount of flow.

It pumped a good flow once I realized that the black wire had to go to Positive and the red wire goes to negative. I believe this is counter to common usage. Good pump for the price.

1 of 1 found this helpful:

Subersable ROV Engine!!!!!!!!

This is the BEST! underwater UAV motor I have ever used! They are fantastic. You have to hack saw off the red cap, but very little modifications otherwise. I go to a hobby store and get a impeller for a model boat.


1 of 1 found this helpful:

It works, but cant lift water very far

Using a properly sized flexible tube, tried to push water from a tank on the ground up to a tank on top of a table above it (~4 feet) and it couldn't do it. Would love a more powerful option, really hard to find a good simple DC pump.

3 of 5 found this helpful:

Not enough pressure

I bought this to make a watering system for me green house, but it did not make enough pressure to get the water up 3 meters in a 1/2" hose. Would not reccomend it for making "fountain or waterfall" as the description states.

Sorry it didn't work for you. Please contact us if you would like to return your device. https://www.sparkfun.com/returns

OK for starter projects

Really low PSI but fairly rugged.