Doing a quick search , I'm coming up with folkslooking for that part number. I would think there might be several items less specific to Rv that would work.
But can you tell us more aboutwhere and what it does, like size of the connections?
I have seen a few people who will put a 1/2" T fitting in and a simple ball valve to operate the drain. From what I've seen these stock pull valves are notorious for failure as deposits get into the valve and don't allow it to shut all the way. I had to open and close mine many times before it would stop the flow of water at the beginning of this season