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Some folks have used PVC for plumbing. Biggest problem is tight spaces where a length of pipe cannot be run.
You must not attach the PVC directly to hard fittings like a thru-hull for fear of cracking. You'll need a short piece of hose to make the connection.
I bought a PVC 90d elbow with special 1.5" PVC to 1.5" hose barbs. I looked but cannot find the reeipt to tell you the manufacturer. It is a marine supplier.
Take a look at my threads on seacocks and also Y-valves. Several good posts helping me with very similar issues.
Re-reading your post: You should use bronze elbows, valves and fittings at the seacock connections
Last edited by xort; 01-20-2009 at 05:33 PM.