Adding air break to stop siphoning

[marblerun]

Hi all

Need some advice please.

The wash basin in out bathroom is siphoning the water out of the bath p trap, allowing air entry and smells.

I’d like to add an air break on the exterior pipe work.

My preferred and easiest location is location 1 in the image. All pipework is 40mm. Space is tight and I’ll only get one chance at this!

I’m not too concerned if the bath ends up siphoning the basin as the basin is always in use and the basin trap will fill quickly.

Thanks for your help.

 

[denso13]

1 is fine but better with a proper tee and AAV.

Fit one on the internal pipework to the basin or fit an air admittance trap?

 

[Wayners]

I would run a new bath pipe straight down the side of black rain water down pipe.
I do it in black..
Separate them..

You have that long drop causing suction on one or the other..

 

[Madrab]

Try an anti vac trap on the basin, that should vent the run enough to stop it syphoning the bath.

 

[marblerun]

Try an anti vac trap on the basin, that should vent the run enough to stop it syphoning the bath.

Thanks for suggestion. It’s a pedestal setup with straight vertical. Might struggle with anti vac trap I think. See photo.

 

[marblerun]

I would run a new bath pipe straight down the side of black rain water down pipe.
I do it in black..
Separate them..

You have that long drop causing suction on one or the other..

Thanks. That may well be the best option. Would the two verticals each need an air break at their respective tops? It should be easy enough to tee them in if needed.

 

[denso13]

It’s a pedestal setup with straight vertical. Might struggle with anti vac trap I think

McAlpine Pedestal Trap

75mm water seal straight through anti-syphon (silentrap) trap with 1¼" Multifit outlet and cleaning eye.• 1 1/4" Inlet and Outlet• 75mm Water Seal• Multifit Compression Outlet suits all plastic, copper and lead pipe• Anti-Syphon Valve neutralises negative syphonic pressure and eliminates...

www.toolstation.com

 

[CountryFan]

HepVo valve? Or depending on the age of property a hopper?

 

[marblerun]

McAlpine Pedestal Trap

75mm water seal straight through anti-syphon (silentrap) trap with 1¼" Multifit outlet and cleaning eye.• 1 1/4" Inlet and Outlet• 75mm Water Seal• Multifit Compression Outlet suits all plastic, copper and lead pipe• Anti-Syphon Valve neutralises negative syphonic pressure and eliminates...

www.toolstation.com

Thanks for that. Will check it out.

 

[marblerun]

HepVo valve? Or depending on the age of property a hopper?

We had a hopper before and it constantly filled with leaves even though we had a grill on it. Hepvo I’ll look into it.