In my 1999 Endeavor, I have a minor water leak. During the process of tracking down the leak I found a valve looking object that is in line to the hot water line and mounted underneath my bath room sink above the hot water tank. It is mounted higher than the tank so I think it is an air valve that allows the line to drain properly. Am I correct??

Sounds like a pressure relief valve.

Does it look anything like This, they're pressure relief valves.

Might also be an inline check valve. Hard to tell without a picture.

odds are it is the Black Tank Flush check valve. Doug

Are you positive it is in the water heater line in or out?Tank flush back flush valve would be in the flush line, located as you described and the vent for the tank should be on the outside.Flush valve

What is the object (air valve?) mounted above hot water tank

guidry
Explorer
Dec 04, 2017
Sounds like a pressure relief valve.
gbopp
Explorer
Dec 04, 2017
Does it look anything like This, they're pressure relief valves.
Mandalay_Parr
Explorer
Dec 04, 2017
Might also be an inline check valve. Hard to tell without a picture.
dougrainer
Nomad
Dec 04, 2017
odds are it is the Black Tank Flush check valve. Doug
rockylarson
Explorer
Dec 04, 2017
Are you positive it is in the water heater line in or out?
Tank flush back flush valve would be in the flush line, located as you described and the vent for the tank should be on the outside.

Flush valve
Hondavalk
Explorer II
Dec 04, 2017
Or could it be on the drain line?

https://www.google.com/search?q=air+admittance+valve&rlz=1C1GGRV_enUS772US772&oq=air+add&aqs=chrome.2.69i57j0l5.8027j0j4&sourceid=chrome&ie=UTF-8
gutfelt
Explorer
Dec 04, 2017
rodjburge wrote:
In my 1999 Endeavor, I have a minor water leak. During the process of tracking down the leak I found a valve looking object that is in line to the hot water line and mounted underneath my bath room sink above the hot water tank. It is mounted higher than the tank so I think it is an air valve that allows the line to drain properly. Am I correct??

most likely as said here already the black tank flush anti back drain valve those things are bad for leaking just use a 90 degree 1/2 by 1/2 line joiner and eliminate it
wlstroud
Explorer
Dec 04, 2017
It may be an expansion tank with an air valve for pressurizing the in-tank bladder. Helps eliminate surging and maintains a more constant waterline pressure.
Old-Biscuit
Explorer III
Dec 04, 2017
I think DOUG is CORRECT......

Black Tank Flush 'anti-siphon vacuum breaker backflow preventer valve'
gutfelt
Explorer
Dec 04, 2017
as I was also and now u see why u need a 90 degree 1/2X1/2 connecter to bypass this unneeded valve

Forum Discussion

What is the object (air valve?) mounted above hot water tank

About Motorhome Group

Related Content

generator mount

mounting dish

Fumoto Valve

Frame mount or Bed mount

TAILGATER MOUNT