Basement sump/pit pump sucking water from bathroom sink trap. Will an AAV stop this?

[Thurmanator]

The sump/pit pump in my basement tees into the 1-1/2" drain between the bathroom sink and the bathtub. When the pump turns on, the traps in both the sink and the bathtub are siphoned out, and on a few occasions, the pressure from the pump has pushed water back up into the bathtub. Would adding an AAV to the left and/or right of the tee where the pump ties into the drain line prevent this from happening?

I'm guessing there is probably a better to do this, but I have no idea what the recommended method or location would be. Can someone explain what the best way to tie this into the drain would be? Surprisingly (or maybe unsurprisingly), this was installed by a professional plumber.

Thanks in advance!

 

[Breplum]

You need a professional plumber...there is so much messed up piping there it looks like hacks did it all.

 

[Sponsor]

 

[Reach4]

Usually it is not a good idea to dump your sump pump ground water into your septic tank. Better is to have it go to a place in the yard or into a "dry well".

Have you had your septic pumped recently? It may be overloaded.

An AAV is not the cure to your problems.

You did not ask, but PEX should be supported every 32 inches.