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Old 08-06-2017, 01:40 PM   #11
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I think you will find that grey tank will stink worse than the black,
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Old 08-06-2017, 04:55 PM   #12
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Originally Posted by Stu & Filo. T View Post
I think you will find that grey tank will stink worse than the black,
Stu,

I have to disagree. My s#!t does stink. Grey can be bad but, in warm weather, my black tank has been pretty foul.

I stopped at a truck stop in AZ several years ago that offered "free dump station". There was a semi parked in the way and I could not get to it.

The nice gent that worked there told me "no problem, just pull over that drain grate and dump. They go to the same sewer."

I pulled up and unleashed 86 gallons of black water. It overwhelmed the drain and made a 15' diameter puddle of black water. That is by far THE NASTIEST THING I HAVE EVER SMELLED IN MY LIFE!

Just my $0.02
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Old 08-06-2017, 05:46 PM   #13
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Look at the Hepvo vent. It's a trap and vent in one with no water sitting in the trap which is nice when it comes time to winterize the bus.

Hepvo Waterless Valve
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Old 08-06-2017, 08:36 PM   #14
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Originally Posted by PNW_Steve View Post
Stu,

I have to disagree. My s#!t does stink. Grey can be bad but, in warm weather, my black tank has been pretty foul.

I stopped at a truck stop in AZ several years ago that offered "free dump station". There was a semi parked in the way and I could not get to it.

The nice gent that worked there told me "no problem, just pull over that drain grate and dump. They go to the same sewer."

I pulled up and unleashed 86 gallons of black water. It overwhelmed the drain and made a 15' diameter puddle of black water. That is by far THE NASTIEST THING I HAVE EVER SMELLED IN MY LIFE!

Just my $0.02
guess u wont try that one again... reminds me of the relative who asked me to look at his black tank on his bus which he attached with steel strap and drywall screws... and i told him to bolt it but he thought i was stupid... He then left salem oregon, and when his black tank was full on the freeway by bakersfield, the tank fell out on the freeway and burst... haha
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Old 08-09-2017, 12:18 PM   #15
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OK, general opinion seems to say do it. Appreciate the advice and will take it.
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Old 08-09-2017, 01:32 PM   #16
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Note on the air admittance valve: it's for admitting air. If the thing is working properly it won't let air out of the pipe. It's a check valve. In some situations a rush of water going down the pipe will create a vacuum behind it. If there's no place to let air in then it'll suck out the water from P-traps instead. AAV fixes that problem.

For venting a holding tank you need at least one vent that's open to the atmosphere, unimpeded by an AAV.
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