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Old 07-08-2015, 10:27 PM   #1
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Creating valves for black tank

I have a bunch of polyethylene jet ski tanks lying around. I'm planning to put two ~16 gallon tanks together for each of the grey and black water holding.

I bought a couple of these:
Amazon.com: Valterra T40 3" Hub x 3" Spigot Valve Assembly: Automotive

Sliding valve assemblies.
I'm hoping that I can put a hole in the bottom of the tank, slide one side in and seal/glue it. Has anyone made their own tanks like this? What kind of sealant did you use?
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Old 07-08-2015, 10:46 PM   #2
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I would weld it and not use sealant/glues you can get plastic welding equipment from Amazon, some requires a shield gas just like welding metals. But once your set up plastic welds very similar to metals. Be sure not to weld the valve on but weld a flange on for the valve then install the valve to that flange, also unless the tanks are square they won't make good black tanks
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Old 07-08-2015, 10:51 PM   #3
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The tanks have a gentle v-shaped bottom. Some of them have 9 bolts around the top hole. We were thinking of turning the tank upside down and bolting a fitting to it that would let us attach the valve.
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Old 07-08-2015, 11:30 PM   #4
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Black tanks need to sloop towards the drain otherwise you will have problems draining it
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