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November 29, 2010
about 5 years ago
Neither. It should be 6mm OD / 4mm ID.
This pump is actually the WP1100 from Welco, and it should be the WI6 fitting type.
I was initially thinking that it could be the J4 fitting type, but if you compare to the compression fittings featured in Bartendro's assembly guides:
You'll see that the pictures of the compression fittings in their guide, matches the compression fitting on the WI6 type on Welco's site.
No public wish lists :(