Holding tank vent clogged or obstructed?
When emptying the gray tank I noticed that it will flow fairly well then slow, followed by a whoosh sound and then drain completely. Also, after dumping the black tank I am noticing an odor. After rea...
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Air Admittance Valve.......
In drain line AFTER 'P' traps.
Used to prevent vacuum in drain lines so 'P' traps don't get sucked dry.
NEVER used on black tank system.
Sounds like yours is not opening and vacuum build up when first draining then water in 'p' trap gets sucked out......whoosh, good draining but now stink comes back into rig cause no water in 'p' trap(s).
Inexpensive......any hardware store.....just screw in to end of stub pipe.
In drain line AFTER 'P' traps.
Used to prevent vacuum in drain lines so 'P' traps don't get sucked dry.
NEVER used on black tank system.
Sounds like yours is not opening and vacuum build up when first draining then water in 'p' trap gets sucked out......whoosh, good draining but now stink comes back into rig cause no water in 'p' trap(s).
Inexpensive......any hardware store.....just screw in to end of stub pipe.
