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07-28-2018, 06:33 AM
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#1
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Junior Member
Join Date: Aug 2017
Posts: 24
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Help with terrible smell from under kitchen sink, please!
We are full time RVers in our Wildcat MK 333 and love it! Recently our lovely little home has had an odor which I suspected was coming from under the kitchen sink (which is in the island). Last night I went to bed determined to find the cause of that smell and this morning when I opened that cabinet door, the smell almost made me sick! (Of course hubby can barely smell it ) After reading this forum on other TT/ RVs, we will check the p-trap first ... any other thoughts or suggestions?
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07-28-2018, 06:38 AM
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#2
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"On the road again"
Join Date: Feb 2012
Location: Parker County Texas
Posts: 1,152
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Robert & Estha Shiflet
Georgetown XL 378TS
Jeep Gladiator Willys Tow Vehicle
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07-28-2018, 06:40 AM
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#3
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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Replace the air admittance valve on the drain pipe in the cabinet.
Bruce
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2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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07-28-2018, 01:00 PM
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#4
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Junior Member
Join Date: Aug 2017
Posts: 24
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Thank you all! Replacing the air admittance valve did the trick ... best $24 ever spent!
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07-29-2018, 07:19 AM
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#5
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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Quote:
Originally Posted by BeachBumJan
Thank you all! Replacing the air admittance valve did the trick ... best $24 ever spent!
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Thanks for getting back to us with your solution! At $24.00, you must have bought one made by Studor or Oatey. It should last much longer.
Bruce
__________________
2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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07-30-2018, 07:56 AM
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#6
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Senior Member
Join Date: Jul 2014
Location: SouthWest Michigan
Posts: 5,977
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Can't those valves be removed and cleaned ???
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07-30-2018, 08:34 AM
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#7
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Senior Member
Join Date: Jun 2016
Location: Mid Michigan
Posts: 1,098
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Looks like you have a fix for now. For future, and others with this problem, you can replace the P trap with a water-less trap that requires no air admittance valve or venting. You can mount them horizontal or vertical.
I think one of the main reasons the industry uses water-less traps is so they can eliminate air vents thru the roof and air admittance valves that can fail.
Good use for water-less traps is when a sink is located in and island like yours and venting through the roof would be difficult.
Also gives the designers more options in where to locate fixtures without having to worry about venting.
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07-30-2018, 08:57 AM
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#8
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,477
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Quote:
Originally Posted by Wolverine 1945
Cindoor an't those valves be removed and cleaned ???
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Yes, but not always successfully. If easy to access then I would try cleaning it first.
__________________
Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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07-30-2018, 03:08 PM
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#9
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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Quote:
Originally Posted by Wolverine 1945
Can't those valves be removed and cleaned ???
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You can try cleaning them, but it is usually the spring that fails or the diaphragm begins to ripple with the cheap black ones.
Bruce
__________________
2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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07-30-2018, 03:20 PM
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#10
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Senior Member
Join Date: Jan 2013
Location: Space Coast of Florida
Posts: 3,964
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Quote:
Originally Posted by markb422
Looks like you have a fix for now. For future, and others with this problem, you can replace the P trap with a water-less trap that requires no air admittance valve or venting. You can mount them horizontal or vertical.
I think one of the main reasons the industry uses water-less traps is so they can eliminate air vents thru the roof and air admittance valves that can fail.
Good use for water-less traps is when a sink is located in and island like yours and venting through the roof would be difficult.
Also gives the designers more options in where to locate fixtures without having to worry about venting.
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I’m confused? The p-trap and waterless trap just stop holding tank odor from coming up into your RV. Don’t you still need air admittance behind the water so the sink will drain quickly and easily? Kinda like holding a gallon jug upside down and the water gurgles out but if you pop a hole in the top the water pours out freely. I think the p-trap and air admittance have 2 different purposes.
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2016 Siverback 33IK, Towed 50K+ mile
2018 Ford F-350 Lariat 6.7L V8 Diesel 4WD Crew Cab
"If you don't know where you are going, any road will get you there."
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07-30-2018, 03:33 PM
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#11
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Gold Tee Box
Join Date: Nov 2016
Location: Rolla, MO
Posts: 563
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We learn something new everyday on the forum...66 trips around the sun and I've never heard of an air admittance valve before, thanks
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Success is hiring someone to mow your lawn so you can play golf for exercise.
2018 GMC 2500 Duramax Denali
2018 Coachman Freedom Express 287BHDS
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07-30-2018, 05:18 PM
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#12
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Senior Member
Join Date: Jun 2016
Location: Mid Michigan
Posts: 1,098
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Air admittance valves are used in place of venting thru the roof when there is not a easy access to a vent. The only requirement for a air admittance valve is that the valve is installed above the spill over level of the sink or shower pan.
The purpose of a vent is so that when emptying the sink, tub or residential toilet the water draining out will not siphon the trap dry.
Inside the water-less trap housing is just a duck bill check valve that opens to allow the water to drain then closes shut to prevent gases, or liquids, from coming up through the drain.
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07-30-2018, 11:51 PM
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#13
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Senior Member
Join Date: Jun 2016
Location: Mid Michigan
Posts: 1,098
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Our new MH came with two water-less traps. One is on the bathroom sink and the other is on the kitchen sink. Both sinks drain as fast or faster as the sinks in every other RV we have owned.
The kitchen sink is on a Peninsula base cabinet with no wall near enough for a vent or a air admittance valve. The bathroom lavatory is located where running to a vent would be difficult.
The shower is sandwiched between walls and has a p trap. One of the walls has a vent thru the roof.
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07-31-2018, 06:30 AM
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#14
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Senior Member
Join Date: Mar 2015
Location: N. Illinois
Posts: 2,371
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Quote:
Originally Posted by Teetime
We learn something new everyday on the forum...66 trips around the sun and I've never heard of an air admittance valve before, thanks
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X2
I've seen it and didn't know what it was called. Knew it was some type of vent so the sinks would drain, but, didn't know exactly how it was supposed to work. This past weekend the DW said she smelled a foul odor when she came in the door. Go figure! Yep that was it. Took it off, rinsed it out. Shook it and sometime it rattled and sometimes it didn't. If you read into these, guess there's a fine spring and diaphragm that goes to heck. And with a desire for more wine and less whining, so, we went around looking for a new one. Mine is Female 1 1/4 NPT threads and downstream of the traps. Will have to look a little further, may have to use a reducer or coupling unless I find the exact animal. What I was finding was all 1 1/2 npt
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2016 Flagstaff 27VRL Emerald
14K Equalizer
2020 Silverado 2500HD CC 4X4 6.6L gas 3.73
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07-31-2018, 06:51 AM
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#15
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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Quote:
Originally Posted by markb422
The only requirement for a air admittance valve is that the valve is installed above the spill over level of the sink or shower pan.
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This is not correct. If it was, there would be very few practical uses for air admittance valves. As long as the air admittance valve is above the trap it is serving, that is high enough. This is why you see them in cabinets, under sinks, etc.
If I am installing them, I try to get them as high as I can under a counter in case there is a stoppage in a drain line, it is less likely that the backed-up water will reach the air admittance valve and get it nasty, but this certainly is not a requirement.
Perhaps you are confusing the air admittance valve with a vacuum breaker for potable water and cross connections.
Bruce
__________________
2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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07-31-2018, 07:24 AM
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#16
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Senior Member
Join Date: Jun 2016
Location: Mid Michigan
Posts: 1,098
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You are correct as far as using it for a single fixture. A air admittance valve should be installed a minimum 4" above the trap for a single fixture and 6" above the flood level of the highest fixture when it's in a stack vent application.
Probably not many RV's that have a stack vent application though.
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09-15-2018, 04:50 PM
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#17
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Junior Member
Join Date: Aug 2017
Posts: 24
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An Update and new question!
The $24 air admittance valve failed within 2 weeks! Took it back to our local RV supply, but they would not provide a refund. Purchased 2 on Amazon and were we glad we did! A week later, I noticed the smell in the bathroom cabinet and after replacing that one, we were all set! All set for a minute, that is ... all of a sudden we have a sewer smell in our RV that seems like it's coming from the bathroom/bedroom area! What in the world is THAT about?? Vent line to the roof? A sniff test around the toilet was ok ... No smell in the bathroom cabinet ... Any thoughts?? I'm hoping when we solve THIS problem, that will be the end of the sewer smells in our home! Thanks all!
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09-15-2018, 05:20 PM
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#18
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,477
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If you running a vent fan be sure you have a window or vent open to allow to enter. A vent fan can over power an AAV. It can also draw in fumes from the black tank.
__________________
Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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09-15-2018, 06:03 PM
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#19
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Senior Member
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,823
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Quote:
Originally Posted by markb422
Looks like you have a fix for now. For future, and others with this problem, you can replace the P trap with a water-less trap that requires no air admittance valve or venting. You can mount them horizontal or vertical.
I think one of the main reasons the industry uses water-less traps is so they can eliminate air vents thru the roof and air admittance valves that can fail.
Good use for water-less traps is when a sink is located in and island like yours and venting through the roof would be difficult.
Also gives the designers more options in where to locate fixtures without having to worry about venting.
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Waterless traps have issues also.
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