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Old 06-14-2017, 11:55 PM   #11
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Join Date: Nov 2011
Location: reno, nv
Posts: 402
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I am a retired plumber.
I added a negative pressure vent many years ago. Got away from the collapsible slip joint.
It has to be added to the top of the plumbing stack in the wardrobe cavity, in my trlr. Highest point! Cut ABS pipe and glue in with correct fitting..

ALSO THERE IS A NEED TO DO A SECONED VENT FROM THE TOP OF THE VENT STACK THAT GOES TO THE BOTTOM OF THE TRLR.

The reason for this ....It is a closed system and produces gases with heat, a positive pressure!. Positive pressure will send sewer gases past the toilet globe seal, into living area.
The negative pressure vent pulls in air when there is drain opened, causing neg pressure.
I ran a 3/8"plastic line down the back wall next to the stack and terminated outside under trlr, using silicone sealant.

Works well, with no smell or gassing issues.
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