This is a prototype. The final will have a slight change as the bottom channel will extend a little more and the channles will be centered in the block. And the starting stopping points will be rounded out a little more to allow a 1/4" NPT threaded barb which is a little over 1/2" wide at the threads. Any size of fittin that uses a 1/4" NPT threaded barb will work. Which should go up to atleast 3/8" hole. That is more than enough to make this block work well. I am only using a 1/4" hole in my barbs for my testing.
Deminsions will be 2"x3"x5/8" overall. Channels is 1/2" wide and 3/8" deep. I left 1/8" of material for the heat to spread on the bottom which seems to work out just right with the design.
