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05-04-2019, 02:11 PM
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#1
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Junior Member
Join Date: Mar 2019
Location: Greely
Posts: 12
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Plumbing Cap under sink?
Newbie. What's the purpose of the capped up-pipe under the sink? Should the cap be on and tight?
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05-04-2019, 02:26 PM
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#2
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Senior Member
Join Date: Feb 2014
Location: radium hot springs bc
Posts: 2,007
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Looks like a vent to allow water to drain to the grey tank.
No it should not be on tight.
And welcome to the forum from Radium Hot Springs BC.
If you are from Greely CO had friends there.
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2018 Ram 3500 6.4 Harvest Edition
2018 Cougar 27RESWE
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05-04-2019, 02:31 PM
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#3
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Senior Member
Join Date: Feb 2019
Location: Wickenburg
Posts: 3,314
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Quote:
Originally Posted by RitchieD
Newbie. What's the purpose of the capped up-pipe under the sink? Should the cap be on and tight?
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Would have helped to see the connections further left, but I'm guessing it is an air admittance valve -- a common way to avoid a through-the-roof plumbing vent stack.
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2019 Cougar 26RBSWE
2019 Ford F-250
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05-04-2019, 02:38 PM
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#4
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Junior Member
Join Date: Mar 2019
Location: Greely
Posts: 12
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Greely, Ontaio, Canada
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05-04-2019, 02:39 PM
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#5
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Junior Member
Join Date: Mar 2019
Location: Greely
Posts: 12
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Left pipe is drain for sink
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05-04-2019, 02:58 PM
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#6
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Junior Member
Join Date: Mar 2019
Location: Greely
Posts: 12
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more pics. Looks like cap might allow it to breath and i should have it on.
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05-04-2019, 03:34 PM
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#7
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,701
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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05-04-2019, 05:09 PM
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#8
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Senior Member
Join Date: Dec 2017
Location: Lisbon
Posts: 551
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It's an air admittance valve and yes it should be screwed on tight.
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2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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05-04-2019, 07:41 PM
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#9
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,997
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Quote:
Originally Posted by Steveo57
It's an air admittance valve and yes it should be screwed on tight.
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In addition to the above, the air admittance valve has a rubber diaphragm in it that often dries out or distorts and starts to leak "smells" into the camper. They do go bad and they are available at Lowe's or Home Depot. Just take the old one with you so you get the correct pipe size. At Lowe's, they're not in the plumbing section, rather they are in the mobile home repair parts section.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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05-05-2019, 04:44 AM
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#10
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Senior Member
Join Date: Nov 2018
Location: Norwood, CO
Posts: 685
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John, would a little mineral oil on the rubber seal extend its life span?
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German Shepherd Guy
2018 Keystone 26RBPR
2014 Suburban 2500, 6L with 3.73 rear
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05-05-2019, 05:03 AM
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#11
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Senior Member
Join Date: Jan 2015
Location: Northeast Florida/Southeast Maine
Posts: 784
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Quote:
Originally Posted by JRTJH
In addition to the above, the air admittance valve has a rubber diaphragm in it that often dries out or distorts and starts to leak "smells" into the camper. ...
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John
I've had a Studor Vent under my S&B kitchen sink for going on 16 years and (knock on wood) have not had an issue with it (maybe because it is used regularly?) Is the Studor Vent design different from the brand typically used in an RV? I know mine has a little ball in it; not sure about a rubber diaphragm.
Ken
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2012 Ford F-250 Lariat Super Duty Crew Cab (gas 6.2 L, 3.73 gear ratio 2WD, 172" WB)
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05-05-2019, 06:33 AM
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#12
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Senior Member
Join Date: Jan 2012
Location: Central San Joaguin Valley, CA
Posts: 2,117
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OLIVE OIL....
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Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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05-05-2019, 11:09 AM
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#13
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Senior Member
Join Date: Feb 2019
Location: Wickenburg
Posts: 3,314
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Probably not once it has become problematic. These units are pretty cheap ($5-7) so periodic maintenance is not cost-effective. I've had these last 30 years in manufactured homes before they had to be changed.
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2019 Cougar 26RBSWE
2019 Ford F-250
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05-05-2019, 08:46 PM
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#14
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,997
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I think the "reliability issue" with RV use versus S&B use has more to do with extreme conditions the air inlet cap is exposed to in an RV. Between being stored outside in 90F+ temps and -0F temps, the "internals" just don't stand a chance of lasting as long in an RV as they do in a more moderately controlled environment in a S&B.
As for extending the life, I don't know if using some type oil, olive, mineral, Crisco cooking oil or WD40 would work. My guess would be since the device is an "air admittance" function, it "sucks air into the plumbing when you flush or drain the sink. If there's dust/dirt in the air and "sticky oil" on the internals, then that may shorten the life rather than extend it.... So, to answer: Beats the heck out of me if oil would help or hurt......
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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05-12-2019, 07:53 AM
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#15
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Senior Member
Join Date: Feb 2014
Location: Young America MN
Posts: 372
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If anything (and I would not use anything) something like a dry lube or silicone would attract much less dust and debris.
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39 foot Forest River Vengeance dragged by GMC 3500.
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05-12-2019, 08:12 AM
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#16
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Senior Member
Join Date: May 2014
Location: Eastern GTA
Posts: 195
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Here is a very recent video from RVgeeks about that air admittance valve.
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2023 Rockwood Signature 8262RBS
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2011 Rockwood Signature 8293SS (2014-2018)
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05-12-2019, 09:18 AM
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#17
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Junior Member
Join Date: Apr 2016
Location: Tucson, AZ
Posts: 14
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Quote:
Originally Posted by jsmith948
OLIVE OIL....
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Olive oil is great for cooking but not as a lubricant since it will get rancid over time. Canola oil would be better but for something like this I would use silicone gasket/o-ring lube, which I get from swimming pool supply stores (can probably be found at Home Depot, Lowe's or Ace too)
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-Ray
2012 Montana 3750FL
2016 Ram 3500 6.7L Turbo Diesel 4x2 SRW CC LB
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05-12-2019, 12:29 PM
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#18
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Senior Member
Join Date: Jan 2012
Location: Central San Joaguin Valley, CA
Posts: 2,117
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Quote:
Originally Posted by RayT
Olive oil is great for cooking but not as a lubricant since it will get rancid over time. Canola oil would be better but for something like this I would use silicone gasket/o-ring lube, which I get from swimming pool supply stores (can probably be found at Home Depot, Lowe's or Ace too)
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Sorry...I was referring to an old thread on here about lubricating blade valves and toilet ball valves and seals.
It was kind of an old inside joke. Fetus2, our dear departed moderator, and I went back and forth on the subject. It was tons of fun...miss that guy.
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Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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05-12-2019, 01:36 PM
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#19
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,997
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Quote:
Originally Posted by jsmith948
Sorry...I was referring to an old thread on here about lubricating blade valves and toilet ball valves and seals.
It was kind of an old inside joke. Fetus2, our dear departed moderator, and I went back and forth on the subject. It was tons of fun...miss that guy.
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I heard from Festus2's DW a bit ago. She is doing well.
Every time I read a comment about olive oil on the forum, I think about that exchange with Geo, Festus2, you, me and several others. You know, with just the right amount of vinegar (brands do make a difference) we created some awesome "black tank salad dressings"..... I chuckle at some of the recipes, but that's about as far as my "courage" will allow me to go......
Believe it or not, I do pour a little "cheap olive oil" down the toilet trap occasionally. It does seem to help the blade valve to slide a bit easier...... (vinegar optional)
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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