Been noticing some leakage from the black tank valve, so figured it was time for it to be replaced. Given that both valves have been in service for sixteen years, I decided to replace the entire valve assembly.
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| the assembly as purchased |
A word of warning, make sure the tanks are empty and cleaned out as well as possible before starting, as once the valves are removed, you are going to be pretty up close and personal with both of those tanks.
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| 1.5" grey tank valve |
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| 3" black tank valve |
No need to disconnect any of the tubing from the waste tanks, as removing the eight bolts that hold the valves and dump tube together, will allow the entire valve assembly to be removed, and the new valves and dump tube installed. Remove the old seals from the tank side fittings, which remain in place, clean up the surfaces where the old seals came off, then install the new seals to those fittings.
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| valves and dump tube removed. tank side flanges remain |
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| new seals installed |
The two valves and dump tube were slid into place and then bolted together. Make sure all the seals are seated correctly before starting on the bolts. Easiest to assemble one valve at a time. Tighten up the bolts up snug, check the operation of the valves and the rotation of the dump tube. The dump tube should require a bit of effort to move, as you want it to remain in whatever position you place it. Overall, a very simple job.
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| shiny new assembly |
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| ugly old assembly |
Even if only needing to replace one valve, it just makes sense to replace the whole assembly, as it’s mostly going to be apart anyways. A bit more initial outlay, but it ensures you won’t be doing this job again anytime soon.
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