[Richard]

Glenn,

I agree with Micheal about that being an automatic drain. You could replace it with one of the same, replace it with a manual petcook, or replace it with one of the lanyard pull drain valves.

I personally don’t care for the auto drain or the lanyard drain valves for the simple reason that the device drains rusty water. The debris in the water can and sometimes does cause the valve to stick and leak as you have observed.

A different alternative, which I have been running on our coach for about five years now, is to install a DOT compliant fitting in the drain hole, run DOT air line to a convenient place on the coach and use a quarter turn valve to cap the line. I also installed a section of line to drain the from the valve to direct the water away from my feet. It is easy to give the valve a quick turn when you want to drain the tanks, with the added bonus that you get to see what is draining from the tank.

And like Dave said, chock up the frame members before crawling under there.