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  1. #1
    Setting Up Camp
    Join Date
    Jul 2016
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    Rockledge, FL
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    Black / Gray Discharge pipe

    A couple of weeks ago, I had an issue with my black tank valve. I ultimately was able to create enough movement in the 4" pvc pipe by removing the foam insulation from around the pipe (where it passes through the frame/bulkhead) to remove the valve, clean it, lubricate it and put it all back together (SUCCESS).

    This got me to thinking, if I reseal the passthrough with foam, and I ever need to work on the tank valves again, i'll have to remove the foam and repeat the process. Legally (or safely), can I add a 4" pvc union to the exiting pvc pipe (in the underbelly side) so that I can seal with foam, and still have the capability to disconnect the waste valves from the PVC discharge?

    Reference coach = 2017 Momentum 397TH

    Thanks!

    Click image for larger version. 

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  2. #2
    Rolling Along kevinpo's Avatar
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    Oct 2015
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    Spokane Valley, WA
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    Hello,
    The short answer is certainly! For extra strength I would recommend schedule 80 rather than schedule 40 pipe. Also it would be best to be sure it's PVC to PVC rather than ABS to PVC (like pipe is best). Be sure to use primer. On the internal O ring put a little silicone grease and it will be easier to open and last for years without leaking or hardening.

    HTH,
    Kevin
    2015 Ram Laramie 3500 4x4 LB Dually Crew Cab
    6.7L I6 Cummins Turbo Diesel Engine 5th wheel Prep
    68RFE Transmission Auto Level Rear Air Suspension 3.73 gears


  3. #3
    Site Sponsor Cate&Rob's Avatar
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    Jul 2014
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    @VentureRider,

    A threaded union is more complex than what you need for an ABS drain connection. Home Depot (or similar) stock rubber sleeves held in place with hose clamps, that work just fine. I divided my drain manifold into three pieces (one for each gate valve) so that I could remove each one individually. See pg 13 of the attachment to post 1 of this thread https://www.mygrandrv.com/fo...968#post171968. BTW, the drain ABS is usually 3", not 4".

    Rob
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    Cate & Rob
    2015 Reflection 303RLS

  4. #4
    Setting Up Camp
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    Jul 2016
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    Brilliant!

    Putting one of these near each tank valve would be a HUGE timesaver.

    Thanks (x 100), Rob!

  5. #5
    Paid my dues 😁 FT4NOW's Avatar
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    Sep 2016
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    I have used that same coupling in 2 locations thanks to Rob's advice from when he did his gate valve replacement. It is a HUGE time saver!

    Sent from my SM-G950U using Tapatalk
    2023 Momentum 398M-R
    2023 Ford F-450

    SOLD - 2021 Reflection 311BHS
    SOLD - 2017 Momentum 399TH

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