Its a concept I'm going to try, and once you start thinking about it, it does start to open up new possibilities for block design, i've got a few i'd like to give a go.
First off will be done without barbs, just using 1" copper pipe with 1/2" pipe inside it. I'll try to get something knocked up soon, give everyone a better idea of what its actually going to be like.
It might be impractical for a mass produced block, but as a one off, it would suit my system fine. I don't use a case for starters
