BurbMan wrote:
I had the same issue, the downward angle of the nylon plug, combined with the size of the hex, made it hard to get a socket on. Using a drill bit that matched the diameter of a coat hanger, I drilled shallow holes in opposite sides of the hex on the nylon plug and bent a piece of the coat hanger to form a D-ring. Insert the ends into the holes and crimp it into shape with pliers. Tip: paint the wire so it doesn't rust.
I don't have an actual pic right now but here is the idea:
With a little teflon tape the plug doesn't need to be very tight to seal properly. Now I can install/remove the plug without tools.
Lantley, my first thought was to install a valve like you did, but there was NO room...this was my plan B.
Burbman that is quite an en-genius design. You may want to patent it. I like it.