Was in Cape May recently and visited a place called Seagear Marine Supply, 609-884-2711 they supply the commercial fishing industry primarily but also sell to the recreational side of boating.
It's a family run organization, has more gear for boats than I knew existed and best of all they keep a Port Supply and West Marine catalogs on hand and will beat their pricing.
Anyway they had some stainless steel y-valves and seacocks with a locking mechanism to comply with the lockout rules intregal to them, they have been selling a lot of them since the CG recently cracked down on the commerical fishing fleet and fined a lot of folks for not having their overboard discharge locked. And the pricing was surprisingly very good. I didn't price the y-valves but did price an 1 1/2" ss ball valve that is completely disassembleable for cleaning or repair, I figured several hundred bucks, I forget the exact price but it was in the neighborhood of $87.00.
We bought netting for the cockpit to keep the little one on board, they cut it to length from a very large roll at no extra charge, total cost for 30' of netting $26.00 a whole lot less than what West Marine wanted for one side. Very friendly and helpful folks. No website just yet, though they are working on one and may have some of it up and running.
When I redo my head/holding tank this next year they will get my business for parts!