Where is check valve on 2008 2980RL

[Jim n Vicki]

We have a 2008 2980RL - I have searched the archives but only find comments on the check valve location on other models. Does anyone with a 2980RL know where it is?

Thanks!

[jimcol]

Jim n Vicki, Don't have a 2980 but try this previous post for more info: http://www.montanaowners.com/forums/...ad.php?t=39955 . I think it will answer your question.
Jim

[Jim n Vicki]

So far we have read all the messages and looked for every suggested places, so far no luck ;-(

[jimcol]

Jim & Vicki, I thought since Trailer Trash had a 2980 they might be in the same place. I guess I also assumed you were talking about the black tank flush check valve. Did I assume wrong?? Perhaps a call to your dealer or Keystone might provide the answer. Good luck.

[Jim n Vicki]

Yep, our black tank flush system is not functioning right, starts but then stops, someone suggested it might be the check valve, therefore the question. I think we might have to do more research into the plumbing system.

[carlson]

There usually is no check valve.
What they install is a vacuum breaker, that is usually located high in the unit.
When you flush it closes and when you stop and remove the hose from the fitting, it lets some of the water to go to the outside connection and some back to the flush.
Look in the closet just inside the door or above the TV, you will find a gray or brown plastic panel with 4 screws (one in each corner), remove the panel and it should be behind it.
If your flush does not work, the little holes may be plugged up, try putting a little air pressure to it and try and clean out the little holes.
E. Sven

[HamRad]

I don't know all the technical terms for this device but I looked up CHECK VALVE and VACUUM BREAKER and the descriptions are below. Take your pick. To me they sound very similar.

HamRad

CHECK VALVE
"A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, and/or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal."

BREAKER VALVE
"A vacuum breaker is an attachment commonly placed on a bibcock valve or toilet or urinal flush valve, that prevents water from being siphoned backward into the public drinking water system. This prevents contamination should the public drinking water system's pressure drop.

A vacuum breaker typically contains a plastic disc that is pressed forward by water supply pressure, and covers small vent holes. Should the supply pressure drop, the disc springs back opening the vent holes (which let in outside air), and preventing backflow of water.

A more complex valve that accomplishes much the same purpose is the backflow preventer."

[Trailer Trash 2]

on my 2980 RL the flush anti syfen is under the sink in the bed room at the very top and in the back.

[dieselguy]

On my old 2005 2980RL it was the same ... under the sink in the bedroom. It was a black rounded top looking PVC fitting.

[Buck1941]

I can't find mine on my 2010 Montana 3150. I think it's behind the shower but not sure. I will find it and remove it as soon as possible before it breaks. If any one know where it is for sure,please let me know.

[Rondo]

Well I'm with Trailer Trash 2 and dieselguy and finding mine in under the bathroom sink. At the present we have a 2004 2980. It is up in the upper part of the back and not the easiest place to see or get to but it is there! If you don't find it there (sometimes its put someplace else--Why?--I have no idea), check your closet/cabinet as you come inside the unit on your right, and see if there is a hole cut in the back of the closet. Sometimes there is a plastic cover over it and sometimes not. Close the sliding door between the main floor and the top of the steps and look in there or reach in and you should see/feel it. Again not the easiest place to get to. That's the two places they like to put them and one never knows where it may be for sure. Usually in the 2980's it is under the bathroom sink however! Let us know what you find!!

[rohrmann]

We have a 3402, but the easiest way to locate the valve is, hook up the flush system and turn on the water, go inside the rig and you can trace down the valve location by listening. On ours, the water flow makes quite a bit of noise, so maybe this will help.

[BB_TX]

I was able to confirm the location of mine by looking in the basement and under the shower. (don't know if you can do that). There were 4 water lines going up thru the floor. Since the shower only needed two (one hot, one cold) that pretty much confirmed the valve was in that wall behind the shower also. And with a little further searching thru an access panel I did find it there.

[DQDick]

Exactly. Once you have the cover off the back of the convenience center you can begin to trace it from there. Even if it's a weird one behind a cabinet, just follow the line coming out of the flush feed to wherever it goes.

[Buck1941]

I want Thank everyone who responed to my search for my check valve/ anti-syphon- back flow preventer. I think I have located it like BB_TX said, it behind the shower. I used food coloring in the convenience center. I put a small amount of food coloring into the flusher and watched the PEX to see what lines the color went through. Tomorrow I will cut the lines going to the back flow valve and reconnect it. I will add a anti-siphon valve at the fitting for the black tank flusher fitting. Thanks so for the prompt response. There is so much collective experience on this forum. Again, I thank everyone who responded.

[BB_TX]

Would never have thought of food coloring. But can't think of an easier way to trace it. I can definitely see the pink antifreeze in my lines.

[Rondo]

But Dick, what if you don't have a convenient center?

[bigred715]

Thats a good idea about the food coloring or pink antifreeze for finding which lines to cut for doing fix. I'm going to have to do a repair on my leaking anti-syphoning valve since there isn't any access to the valve.It will be quicker and cheaper to just do away with valve and bypass it. Do you need a special cutting device for cutting plastic pipe?

[Buck1941]

I have a PEX cutter form Home Depot about $ 6.00, but you can use a razor knife. Just make sure your cuts square. You can also go to the RV store and get a fitting so you won't have any crimping to do.

[bigred715]

What crimping are talking about? I plan on usaing shark-bite 90 degree elbows and a short pc of pipe in between.