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08-10-2022, 06:49 AM
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#1
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Posts: 182
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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 we’re 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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Thanks, George
2010 Allegro Bus 43QRP
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08-10-2022, 12:44 PM
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#2
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Senior Member
Join Date: Jul 2009
Posts: 1,895
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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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ernieh
2019 Phaeton 37BH
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08-10-2022, 04:56 PM
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#3
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 1,878
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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.
Sent from my SM-G973U using iRV2 - RV Forum mobile app
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2014 Tiffin Allegro Bus 37AP
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08-10-2022, 08:51 PM
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#4
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Posts: 182
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Mine has a cheater on all the sinks. Found them all and replaced. I couldn’t find one one on the washer the pipe goes into the wall. I don’t know what a HEP-v looks like Will have to see if there is an access panel for the shower
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Thanks, George
2010 Allegro Bus 43QRP
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08-10-2022, 08:56 PM
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#5
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 19,611
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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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 2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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08-11-2022, 08:59 AM
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#6
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 1,878
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Here is what a HEPvO looks like. It is used in place of a P trap. 
Sent from my SM-G973U using iRV2 - RV Forum mobile app
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2014 Tiffin Allegro Bus 37AP
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08-11-2022, 10:00 PM
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#7
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Senior Member
Tiffin Owners Club
Join Date: Dec 2018
Location: Nacogdoches, TX
Posts: 1,342
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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.
Thanks,
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Wade & Debby Griffin
2018 Tiffin Allegro Open Road 32SA, Ford F53 24K Chassis
2012 Jeep Liberty
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08-12-2022, 06:10 AM
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#8
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Senior Member
Join Date: Oct 2009
Location: Montrose, PA
Posts: 179
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They screw on.
Bob
__________________
2022 Tiffin Allegro Bus 35CP, 2022 RAM EcoDiesel
2017 Tiffin Allegro RED 33AA (sold)
2016 Airstream Interstate Grand Tour (sold)
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08-12-2022, 06:17 AM
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#9
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Posts: 182
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Quote:
Originally Posted by wog099
To replace an air admittance valve are they glued on or screwed on? I'm considering getting a spare to carry in the MH.
Thanks,
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Screwed on
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Thanks, George
2010 Allegro Bus 43QRP
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08-12-2022, 06:20 AM
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#10
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Posts: 182
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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 can’t find them. I also don’t see anything that looks like the HEP. The washer definitely has a P trap. Anyone with a coach near my year found these guys ?
__________________
Thanks, George
2010 Allegro Bus 43QRP
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08-12-2022, 09:24 AM
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#11
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Apr 2012
Location: Southern NM
Posts: 3,089
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Quote:
Originally Posted by glsponchos
I talked to Tiffin yesterday. The guy said the washer and shower both have cheater valves on my model. I still can’t find them. I also don’t 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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If you have HEPVO valves, they’re usually under the floor. There should be an access panel nearby.
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2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD
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08-12-2022, 11:16 AM
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#12
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,810
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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.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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