[twindman]

While you are shopping, get the exterior shutoff valve that goes on the end of the trailer drain. I forget the real name for it, but it just hooks on like a hose connection but has a valve inside and the same kind of hookup that was there. That way you can shut off the end of the drain, so when you take the end cap off, you don't have to get messy. An added advantage is if one of the real valves stops functioning, you can still get by for a while (assuming you get the real valve open one time).