Quote Originally Posted by DarthBeavis View Post
I bought a 1/4-18 NPT and it seems to work ok.

Yeah it does work, but if you're not carefull with the barb it can try to cross thread on you.

I have a 1/4 -18 NPT and a 9/16-18 for the two barb sizes. The 1/4-18 NPT works, but it's just not as perfectly smooth as the correct tap. I can finger tighten my 9/16-18 barbs, but have to use a wrench and be very careful on the G1/4 barbs when using the npt 18 tap.

I have a sneaking suspicion that whomever manufactures the db-1 was using a 1/4 - 18 npt tap to tap all the initial db-1 barbs. You might recall alot of people having problems with the threading.

I used it on my first block here too, but you can see in the lexan how the metal barb threads are not exactly perfect matching the cut lexan:



This won't do...I want perfect!