I did exactly that on a Krogen with a stainless holding tank. We found out two things:

1. The sewage REALLY stinks because absent vents and air circulation, the anaerobic bacteria do all the digesting.

2. #1 was discovered when someone had the floor hatch out and stepped on the bladder, causing the fittings to pop off!

Joe

Coquina

On 12/6/2018 10:42 AM, Dennis C. via CnC-List wrote:
Maybe I'm not visualizing it correctly but if you can get the top of the tank exposed, why not just cut the top out, clean up all sharp edges and drop a flexible bladder into the tank?

Dennis C.

On Thu, Dec 6, 2018 at 9:35 AM Josh Muckley via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:

    Len Mitchell replaced the tank on his boat. He'll probably answer
    up but if he doesn't his email is here.
    len.mitch...@bell.blackberry.net
    <mailto:len.mitch...@bell.blackberry.net>

    As I recall he got everything apart but the final movement of the
    tank was precluded by the cabinets. He had to make vertical cuts
    between the cabinets.

    Josh Muckley
    S/V Sea Hawk
    1989 C&C 37+
    Solomons, MD



    On Thu, Dec 6, 2018, 9:56 AM Daryl McKelvie via CnC-List
    <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> wrote:

        Hi guys, I'm trying to work towards getting the boat ready for
        a trip south starting summer 2020 and one of the big things on
        my mind is the original aluminum holding tank, which I'm told
        will eventually start leaking and get a new plastic one in
        there, problem is getting it out, short story: friend with
        same boat, he and the marine yard decided there was absolutely
        no way it was coming out, cut the plastic vanity, replaced
        with a nice teak strip to hide cut, looks great, $3500 and
        that was 5 years ago. Without taking everything apart I'm
        looking at it saying but it looks like it might fit. Question
        to any owners: has anyone seen this done, can anyone say it
        will absolutely fit with making cuts, before I start taking
        things apart, I know it's been discussed on here before but
        I'm hoping to find a definitive yes or no, thanx guys.

        Daryl McKelvie
        Sarnia Ontario
        1989 37/40+
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