I got it at
www.highspeedpc.com . Scott sent it to me to review, so I am going to try and crank out performance data this weekend.
Yes it is 3/8", and the fittings just unbolt right out. They are very cool and have o rings on the top to keep a seal without any other type of waterproofing. I can get the 1/4" x 1/2" barb that I got off a dtekcustoms sidewinder about a half turn into the block, but the threads aren't right. I have some 1/4" x 3/8" barbs off a Dangerden maze2 though that thread right into the block no problem. Maybe either dangerden or Danny uses something other than NPT. In any case, I have an order from dangerden on the way with a new revision maze2, and some 1/4" NPT x 1/2" fittings, so I hope that the barb will thread right in. If not I will liberally apply plumber's goop
I'll test out the blocks with both 3/8" and 1/2" I guess. Sorta an indirect way to adjust flow in the system though...