MC Ive used polyethelene. Its good and not at all brittle, so cracking/overtightning of barbs wont be a problem. Its very easy to machine aswell, probably easyer than polycarb/others..
Polyethene is one of the plastics that cant be glued or joined easly with other plastics to get a good mechanical bond, I tryed with several glues...
I used sillicone sealant to get my blocks sealed, and they havent leaked yet (I tested it on mains water, thats about 20 - 35psi iirc?)
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