Tim,
Brass is an alloy of zinc and copper and as it gets corroded by salt water, a blue green surface layer called patina forms on it to prevent the further corroding. The patina is a copper compound which is not good for our animals as Harry pointed out.
Thank you, TheGriffins, for the info on the valve. The local Ace Hardware here has a 1" one, but it's threaded on one end. I suppose they can order one for me if the other Ace has the right one. I will talk to them. How do you like the mod you did?
Tomoko
Tomoko