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Old 08-10-2022, 06:49 AM   #1
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Cheater vents

Recently I learned about the use of cheater vents in motorhomes I always thought everything routed through the roof vents The cheater vents are on all my sinks They weíre all bad and allowing sewer gas into the coach My question is does anyone know whether the shower and washing machine use cheater valves or are they actually routed through the roof ? Thanks
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Old 08-10-2022, 12:44 PM   #2
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They are called AAV's (air admittance valves). Better quality ones are available at any plumbing supply store. It's quite possible that TMH used Hepvo traps on your washer, shower, and possibly kitchen sink in which case a vent is not needed. Only your eyes can confirm for sure.
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Old 08-10-2022, 04:56 PM   #3
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Our 2014 Allegro Bus 37AP has 2 AAVs in the bathroom for the sinks there & shower. HEPvO in the kitchen & washer.

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Old 08-10-2022, 08:51 PM   #4
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Mine has a cheater on all the sinks. Found them all and replaced. I couldnít find one one on the washer the pipe goes into the wall. I donít know what a HEP-v looks like Will have to see if there is an access panel for the shower
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Old 08-10-2022, 08:56 PM   #5
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On ours, the shower and the washing machine both use the HEPVO valves which don't require an AAV to provide air behind water.
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Old 08-11-2022, 08:59 AM   #6
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Here is what a HEPvO looks like. It is used in place of a P trap.Click image for larger version

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Old 08-11-2022, 10:00 PM   #7
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To replace an air admittance valve are they glued on or screwed on? I'm considering getting a spare to carry in the MH.
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Old 08-12-2022, 06:10 AM   #8
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They screw on.

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Old 08-12-2022, 06:17 AM   #9
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Quote:
Originally Posted by wog099 View Post
To replace an air admittance valve are they glued on or screwed on? I'm considering getting a spare to carry in the MH.

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Screwed on
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Old 08-12-2022, 06:20 AM   #10
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I talked to Tiffin yesterday. The guy said the washer and shower both have cheater valves on my model. I still canít find them. I also donít see anything that looks like the HEP. The washer definitely has a P trap. Anyone with a coach near my year found these guys ?
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Old 08-12-2022, 09:24 AM   #11
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Quote:
Originally Posted by glsponchos View Post
I talked to Tiffin yesterday. The guy said the washer and shower both have cheater valves on my model. I still canít find them. I also donít see anything that looks like the HEP. The washer definitely has a P trap. Anyone with a coach near my year found these guys ?
If you have HEPVO valves, theyíre usually under the floor. There should be an access panel nearby.
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Old 08-12-2022, 11:16 AM   #12
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If you have the HEPVO valve/traps, DO NOT try to back flush or use a snake on them. Read the instructions on removing to clean.

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