2021 Cornerstone gray water odor

[TampaBob]

I need help locating the sink drain traps on our coach. From my read on other threads there should be traps and vents on each sink.

I have isolated the odor in our bathroom to the 2 aft sinks in the master bath by closing the drains and filling them with an inch of water. As long as I keep water in the sinks, we no longer have an odor. A couple hours after draining the sinks the sewer smell returns.

We have inspected all visible component of the sink drains and cannot find any traps, upward sloped lines or any under sink vents. The mid- bath and kitchen do not have any visible traps either. I can not find either a trap or a vent line. Anywhere. I have traced the lines until they disappear between the floor tiles.

There is a small portion of the sewer line visible at the gray tank, but I still can not see any trap.

My last thought is that somewhere sandwiched between the flooring sections is an upward sloped line to keep a water seal in the drain? Can really use an explanation to the plumbing drain system on our coach.

Also, our coach is level as verified by a 4' carpenters level.


I am thinking that the first season we owned the coach, the tank was still too new to develop the odors, and now that we are on our our second summer season of use, the tanks could use some disinfecting and cleaning. For now we are adding pine-sol and fabulous to the drains.......


Bob & Julie
2021 Entegra Cornerstone Model 45F

[Old-Biscuit]

Sounds like HepvO waterless traps were used

https://hepvo.com/hepvo-waterless-valve/

Can be installed Horizontal or Vertical


'Duck Bill' should close/seal and not allow waste tank odors back into RV
Debris from installation could hold them open....remove/clean
OR if hortizontal install the RIBS must be down

[Bobby Dowdle]

If your plumping looks like the photo, the white ribbed tube is the vacuum breaker and would need to be swapped out. If you have hard plumbing, there will be a vertical pipe with a vacuum breaker in the top of it. It needs to be swapped out. Have you run your washing machine lately. The p trap there dries up and allows in odors as well. Can you provide a picture of the plumbing under the sink please.

[Old-Biscuit]

Originally Posted by Bobby Dowdle

If your plumping looks like the photo, the white ribbed tube is the vacuum breaker and would need to be swapped out. If you have hard plumbing, there will be a vertical pipe with a vacuum breaker in the top of it. It needs to be swapped out. Have you run your washing machine lately. The p trap there dries up and allows in odors as well. Can you provide a picture of the plumbing under the sink please.

No that is NOT a vacuum breaker
It is the HepvO waterless trap (replaces a 'P' trap)

[TampaBob]

Here’s what it looks like under the sinks, too the floor

[brobox]

Bob, check your drain if it has the water-less P trap or this vent. If it has the Studor type vent, change the factor one shown to this one. https://www.lowes.com/pd/Studor-Mini...ter/1000604287


The factory valves are famous for sticking open causing the odor.

[Gary.Jones]

Bob

Your vintage coach should be equipped with the Studer type valve Chuck mentioned.

Gary

[brobox]

Bob, sorry, you posted your photos about the same time I posted mine. From your photos I do not have a clue where the vent line is for your floor plan. You plumbing shows a P trap, but noting for a vent.

[TampaBob]

I suppose I’ll open up that pipe and look to see if it’s some type of waterless p trap. I’ll update soon.

[brobox]

Originally Posted by TampaBob

I suppose I’ll open up that pipe and look to see if it’s some type of waterless p trap. I’ll update soon.

That is just a sink 90 and not even really a P trap..
Photo #3 the white PVC on the right side, would that be the waterless P trap?

[TampaBob]

That white pvc might be one. It is under the bathroom cabinet. I pulled the center lower drawer out and to the picture in the dark to the side with a flash . The only way to get closer for a good look would be to take the bottom out of the cabinet. I suppose if Entegra would chime in and confirm it’s existence, then I would explore that further.

[brobox]

Originally Posted by TampaBob

That white pvc might be one. It is under the bathroom cabinet. I pulled the center lower drawer out and to the picture in the dark to the side with a flash . The only way to get closer for a good look would be to take the bottom out of the cabinet. I suppose if Entegra would chime in and confirm it’s existence, then I would explore that further.

The air admittance valve I showed was in my 1/2 bath. Check and see if on your floor plan if that is not where the vent valve might be?

[TampaBob]

[TampaBob]

Resolved: was able to get a mirror up to the white section of pvc. It is exactly what voltdoc thought. It’s the waterless check valve.

Thanks.