Air Admittance Valve
On a recent hot weather camping trip, we noticed "that smell." You know, the nasty sour GREY water smell you should only experience when dumping the greay water tank? I discovered we have one of these...
Forum Discussion
Air Admittance Valves can be used in Mobile Homes/Manufactured Homes/RVs (Local Codes applicable)
They are used where roof venting is limited and provide extra air into drain system when waste water flows.
They are there to stop 'P' traps from getting sucked dry when drain water is flow especially on RVs when dumping waste tanks.
There are some cheap ones......use a flapper held in place with a 'tang'
Over time the tang stretches....no more positive closure
They cost $4-$5
Then there are much better ones.......use a spring to hold a diaphragm closed
Longer lasting, better closure and cost $25 plus
Majority used in RVs....cheap flapper type
They are used where roof venting is limited and provide extra air into drain system when waste water flows.
They are there to stop 'P' traps from getting sucked dry when drain water is flow especially on RVs when dumping waste tanks.
There are some cheap ones......use a flapper held in place with a 'tang'
Over time the tang stretches....no more positive closure
They cost $4-$5
Then there are much better ones.......use a spring to hold a diaphragm closed
Longer lasting, better closure and cost $25 plus
Majority used in RVs....cheap flapper type
