Bruce Brown wrote:
Old-Biscuit wrote:
Just drill a 1/8" hole on high point of overflow pipe.
Yup. I've done this with every MH we've ever owned.
If possible, I extend the height of the overflow with a T first. I put a plug in the top of the T then drill a small hole in that (red arrow). I use the side of the T for the overflow. We've been camping for over 20 years now and this method has always worked. Simple, cheap, effective, and nothing to fail.
A very good home-made anti-siphon valve. Since these are on the potable water tank, I would add a small screen to the opening to keep dirt and insects out of the potable water tank.