Butcher what is strange is that I have some fittings off of Dtekcustoms waterblocks, and those fittings are not the same thread (TPI) as the dangerden ones. It was a pain to get them to go into my Maze2, and I can only get them about 1/2 a turn into the Innovatech block. The 3/8" fittings from my maze2 screw in 2-3 full turns by hand into the innovatech, and I am certain that they would be fine. I just need some 1/2" barbs with the same TPI