Replacing an RV Waste Holding Tank – Black OR Grey Water

Having to replace an original holding tank can seem like a huge task, but for the ‘Do it yourself’ minded – it can often be a lot simpler than first thought. Here’s how it goes:

  1. You’ll want to measure out your original tank (and any extra area that would allow you to upgrade to a larger tank) to allow you to find an appropriate replacement. Planning out and ‘mapping’ your plumbing is also part of this initial step. Make note of drain location on the original tank and any extra fittings/components that you may require to hook up the new tank.

    HT175BED - Example Replacement Holding Tank

    HT175BED – Example Replacement Holding Tank

  2. Find a replacement. Comparing by dimensions, you’ll want to locate one that will fit in the area measured in step 1. You’ll also want to consider how you will be mounting the tank. Replacements have a 1.25″ flange for mounting with brackets or screws, so ensure you’ll have room for whichever method.
  3. Remove your old tank if you haven’t already. Typically it involves removal of some screws and/or sliding the tank out of “L” type brackets. You may need to cut out some plumbing fittings and pull out some of the pipes to help configure the new tank.
  4. Figure out where to install the intakes on the new tank by putting it into place temporarily and marking where the inputs should be cut. Precision is important here – measure/mark twice, cut once!
  5. Pull the holding tank back out and use a cup saw to drill the input holes. There is usually one input (2″  fitting or 3″ fitting) and a vent (1.5″ fitting) in most configurations. Install the fitting using an ABS Glue and allow time to cure.

    3

    3″ Threaded Fitting

  6. While the tank is curing prepare all input plumbing to be installed in the tank (appropriate fittings, make sure they are cleaned and make certain you have glue ready).
  7. Place the tank back in & secure. Ensure the tank is lined up with all inputs. Use straps or banding to provide additional support to the belly of the tank.
  8. Connect all inputs with the appropriate fittings & glue. You’re done!

 

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4 Responses to “Replacing an RV Waste Holding Tank – Black OR Grey Water”

  1. FRAN HUHN

    I AM CONSIDERING REPLACING GREY WATER TANK WITH STRIAIGHT PVC LINES STILL HAVE THE BLACK TANK AND HOT WAYTER TA NK iS TIS A GOOD IDEA FRA N

    Reply
    • icondirect

      Hi Fran,

      I’m not sure that would be a good idea. Capacity would certainly suffer I would think and if you use the grey water to flush your black tank, pressure to flush it all through would probably become insufficient.

      I can’t speak to experience however, as I’ve never heard of anyone trying this.

      If you decide to replace your grey tank with a new one however, we can certainly help there.

      –Jordan

      Reply
  2. Susan

    Im installing a new black tank, and the guy that was working on it took it down in a way so he would be the only one to put it back. I need to know how the support beams go and how to secure the tank. I have a forest river 2015 columbus 5th wheel. I cant find a diagram for it. Helpme pleeeeeeez

    Reply
    • icondirect

      Hi Susan!

      This is typically done a number of ways and I’ll infortunately be unable to give you direction on specifics for your model/year. I’d advise that you reach out to the customer service at forest river or consult with a registered forest river dealer.

      Reply

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