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  1. #1
    Setting Up Camp ItchinToGo!'s Avatar
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    Plumbing tank vents

    I only see one tank vent on the roof of our newly purchased 337RLS. Are all of the tank vent lines plumbed into one through the roof vent?
    USN 1978-1999
    2021 Reflection 337RLS
    2018 RAM Laramie 3500 DRW
    Cummins 4500i Generator

  2. #2
    Site Sponsor Canyonlight's Avatar
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    Quote Originally Posted by ItchinToGo! View Post
    I only see one tank vent on the roof of our newly purchased 337RLS. Are all of the tank vent lines plumbed into one through the roof vent?
    Correct - it has been this way since day one of many GDRVs - our 303/other 303s and 337s where the tank layout and plumbing sinks, showers, etc. allow such. I thought I had a picture to share but I do not. You can remove your basement panels and check your 337 at some point.

    Dan
    Dan & Carol
    2014 303RLS Reflection #185 (10/2013 build)
    2012 Silverado LTZ Crew Duramax 2500HD
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  3. #3
    Big Traveler Calbar's Avatar
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    Quote Originally Posted by ItchinToGo! View Post
    I only see one tank vent on the roof of our newly purchased 337RLS. Are all of the tank vent lines plumbed into one through the roof vent?
    Some of the tanks due to layout will be vented with a mechanical vent under the sink like the link below if there is no way to get the vent to the roof. The kitchen Island is a good example of this.
    https://www.lowes.ca/product/air-gap...E&gclsrc=aw.ds

    Rob
    Rob & Barb
    2018 Reflection 297 RSTS
    2019 RAM 3500 SRW 4x4
    2009 Toyota Tundra (retired)
    Waterloo, Ontario, Canada

  4. #4
    Site Sponsor Canyonlight's Avatar
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    I located my pictures. It is difficult to see but you can see the third pipe on the left which vents the kitchen sink to the one roof vent. The other two pipes are the vent pipes from the black and shower/bathroom sink grey tank. They all 3 merge into the one roof vent.

    Also attached are pictures of the AAVs (Air Admittance Valves) referenced by Rob in his post #3 as well as Janice from GDRV as noted in the next sentence and why they are used as well as the roof vent. One AAV is under the bathroom sink and the other is under the kitchen sink in our (and your) island. These white studor valves (better quality) are replacements of the original black ones installed by GDRV at build which failed for a number of us owners over time.

    Here is also a thread and txt copied and pasted covering this in the early days from Janice who was our first direct contact on the forum with GDRV

    https://www.mygrandrv.com/forum/show...ght=admittance

    All black and grey tanks are vented through the roof. The valve under the sink is an air admittance device (ASTVD = anti-siphon trap vent device) which draws air in when water is draining to slow the process so the p-trap is not completely void of water following the drain process. This valve has a diaphragm that is closed when not draining. Grey tank odors are generally associated with a dry p-trap or a bad diaphragm in the ASTVD.

    Best regards,
    ~ Janice


    Dan

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    Last edited by Canyonlight; 02-09-2021 at 10:18 AM.
    Dan & Carol
    2014 303RLS Reflection #185 (10/2013 build)
    2012 Silverado LTZ Crew Duramax 2500HD
    2700/16K Pullrite Superglide

  5. #5
    Setting Up Camp ItchinToGo!'s Avatar
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    Thanks for the reply's everyone. I haven't had a chance to remove the basement panels yet and look around. It's been too cold here, -16 this morning, and not looking any better for the rest of the week!
    USN 1978-1999
    2021 Reflection 337RLS
    2018 RAM Laramie 3500 DRW
    Cummins 4500i Generator

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