Shower drain gurgling

[gjkids]

I have a 2019 Greyhawk 30x. The shower and toilet is separated from the sink in hall.

We have noticed gurgling sounds coming from the shower drain sometimes when we flush the toilet. Does the shower have an air admittance valve like the sink ? If so , where is it?

Please provide any suggestions.

Thanks

[TWP723]

If it has one, it's usually next to the p-trap. Not sure rv's are the same. That would make it unreachable.

[Scoutmaster253]

Originally Posted by gjkids

We have noticed gurgling sounds coming from the shower drain sometimes when we flush the toilet...

Thanks

When this happens, are your Black water and Gray water tanks both connected to a sewer line, such as in a full service site at a park?
If both hoses are connected to the sewer, are both your Black and Gray valves open?

If both are open, then the flow of waste into or through the Black tank could affect the air pressure or fluid level in the Gray tank, causing the gurgling.

[gjkids]

Originally Posted by Scoutmaster253

When this happens, are your Black water and Gray water tanks both connected to a sewer line, such as in a full service site at a park?
If both hoses are connected to the sewer, are both your Black and Gray valves open?

If both are open, then the flow of waste into or through the Black tank could affect the air pressure or fluid level in the Gray tank, causing the gurgling.

No, we are not connected. Also, we never leave the gate valve open.

[Ann-Marie]

We had a similar problem on our boat - - dauber wasps had blocked the tank air vent so now air escaping has to bubble through the hand basin.
I've no idea where the vent would be but that is what I would check first.