3 vent caps on roof

[63belv]

Having trouble with grey tank vent getting a burp in bath sink. While on the roof checking vent I have 3 caps 1 I would say os right side is black tank 1 on left looks to be grey tank bothright above bath area. Now there is 1 just in front of entry door and I see nowhere that is comes through ceiling or goes down the wall, what could it be? On the burp problem I have already changed both plumbing vents under the sinks. Thanks

[Herk7769]

I am not familiar with your layout. It is possible that in your camper the sink does not have a vent that penetrates the roof. Look under the sink for a "ventless" air break that may be stuck closed.

If you have one and it sticks, they are very easy to replace (they unscrew) and very inexpensive.

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[63belv]

Herk, Already changed both of those kitchen and bath. My unit is a 359Xl and there is no plumbing in front of side door. The vent on the roof in front of door seems to go nowhere there is a cabinet there but no pipe showing inside and wall is not thick enough for pipe to come up through the wall. Thanks for your answer.

[dashonthedash]

It could be a dummy cap to cover access for a possible satellite mount. Do you already have a satellite dish or a pre-wired prep package?

[63belv]

dondash Thanks it is wired for sat

[LaydBack]

Do you have a washer hookup up front?

[dashonthedash]

Originally Posted by 63belv

dondash Thanks it is wired for sat

It is likely that one of the vent caps is a dummy hiding the wiring access for the sat; that's how my coach is laid out.

[Tiggerdad]

Possible attic vent? My previous rig had them for that purpose.

[TexasBBQ]

Like Tigg.. said. I have 2 attic vents and 3 plumbing vents. When you replaced it what did you see?

[63belv]

I am going with Gary and say it is a dummy. The coach is wired for sat. and the location fits. Still have not solved burp. Thanks

[dashonthedash]

Try some Alka Seltzer?
Seriously, though, what exactly is happening?

[VinceU]

Any chance the gray tank is under the bedroom? In that case the piping from the bath would be flexible corrugated tubing which might pinch and restrict drainage.

[63belv]

Gary, when we drain the kitchen sink the bath will burp then you have to wipe water off the mirror. It is raining today so i can't go on roof to check roof vent but I am assuming the roof vent is plugged. Before this started when you drained the kit sink you would hear like a rush of air about half way down now you don't.

[63belv]

Not sure of tank location have not been under to check but I will.

[B47]

Originally Posted by 63belv

I am going with Gary and say it is a dummy. The coach is wired for sat. and the location fits. Still have not solved burp. Thanks

Have you or could you run a snake in the drain? You may have a partial blockage caused by an object that is letting some air venting, but not all.

[dashonthedash]

Is the kitchen sink draining normally? Like B47, I was thinking of the possibility of a clog/blockage.

[63belv]

sink drains ok but it seems when it gets to tank it vents through bath sink

[dashonthedash]

What happens when you drain the bath sink?

[63belv]

The drain from the kit. sink has a vent pipe going up to the roof before it reaches the grey tank. No rain tomorrow and I will go up on the roof to make sure it is not plugged. Ot