Dave Solberg is a leading expert in the RV industry and author of the “RV Handbook” as well as the Managing Editor of the RV Repair Club.
I repaired a couple of leaks under the bathroom sink. This connector intermittently releases a small amount of water. Not sure what it is and whether it is functioning as designed. Is it some sort of pressure relief connector? Thanks in advance. —Perry
Thanks for the photo. I can definitely see the water drips on the side wall. I have never seen anything like this valve on the fresh water side. However, I have run into a few “cheater” valves, as we call them, for venting holding tanks. Holding tanks need to be vented just like a sewer line system in a home to eliminate a vacuum for draining. In an RV, the vent comes up inside an interior wall and out the top of the unit with a cap on top of the pipe.
If a holding tank is situated underneath the frame directly below a kitchen countertop, obviously the pipe cannot go up through the counter to the roof. That’s why manufacturers use an anti-syphoning vent cap. It’s designed to allow air to be drawn in with the water flow, but restrict odors from escaping out. I’ll need to do some research and will follow up. Can you provide the make, model, and year of your rig?
Perry wrote back that it was a Keystone Hideout 24LHSWE travel trailer. So I contacted my Keystone rep and he identified it as an anti-siphon valve for the black water tank flush valve, Part # 397250. Most of the black water flush valves I have been associated with are a simple mount from the side of the tank sprayer with a water hose connector on the outside of the tank. This typically has a back flow prevention connection associated with it to make sure waste water from the black water tank doesn’t get overloaded and backflow into the fresh water system.
Perry’s system seems to have the connection valve in the service center and piping going to the black water tank. The valve at the system is just a simple garden hose connection, so they need a backflow prevention valve somewhere inline.
So it is not a vent, but rather an anti-siphon or anti-backflow prevention. It should not leak. You can order a replacement part directly from Lippert at www.lci1.com
Read more from Dave here.
HAVE A QUESTION FOR DAVE?
Ask it here. Please be as brief as possible. Attach a photo or two if it might help Dave with his response.