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  1. #1
    Site Sponsor
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    Pressure build up in sewer line.

    This is something that I never recall having experienced before. When I remove the sewer line cap to hookup the sewer hose I have pressure buildup in the line. The pressure is so strong that the first time I experienced it it blew the cap right out of my hand. What could be causing this?
    2022 Solitude 310GK-R
    Andersen Ultimate TBX Morryde HD skid plate
    2016 Chevrolet 2500 SB Duramax

  2. #2
    Left The Driveway
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    First, at least you know you have good seals! Probably the most obvious reason for the pressure would be an increase in temperature from the time you closed it last. If it is a continuing problem you can change out your dump cap to one with a hose fitting. Then you could release the.pressure easily and safely.
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  3. #3
    Site Team Second Chance's Avatar
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    As mentioned, an increase in temperature will increase the pressure inside the drain pipe (and vice versa). Changes in elevation will also do this. When we came down from 6,000 feet to 4,000 feet, there was negative pressure inside the pipe (drained and closed at 6,000 ft.) which sucked air in as I removed the cap.

    Rob
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    2020 Solitude 310GK-R, MORryde IS, disc brakes,
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    (Previously in a Reflection 337RLS)
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  4. #4
    Site Sponsor
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    Add one of these to the end of your sewer line. It holds everything inside the pipe until you open the valve to allow the other valves to empty. Valterra Twist-On Waste Valve, Mess-Free Waste Valve for RV's, Campers, Trailers. Available on Amazon for $20.00. (Sorry I don't have the link.)

    I added a link...... Valterra Valve
    Last edited by traveldawg; 05-25-2022 at 02:03 PM. Reason: added link to Valterra valve
    Happy campers! / Lorna & Eric and our little furball, Finnan, Canandaigua, NY
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  5. #5
    Big Traveler
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    FWIW, you can get them on Ebay for $8.00. I just picked one up a couple weeks ago.
    Howard and Peggy
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  6. #6
    Rolling Along dryfly's Avatar
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    Quote Originally Posted by nyfingerlakes View Post
    Add one of these to the end of your sewer line. It holds everything inside the pipe until you open the valve to allow the other valves to empty. Valterra Twist-On Waste Valve, Mess-Free Waste Valve for RV's, Campers, Trailers. Available on Amazon for $20.00. (Sorry I don't have the link.)
    \

    What a bummer. I needed two of these about this time last year when they were in very short supply. I had to pay $40 each.

    Mandatory on my Reflection as I get waste water at my drain cap each time I open it.
    2020 Reflection 273MK
    '05 Dodge 2500 CTD

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