The tank is made from ABS plastic. I cracked the entire length of the top on my black tank by over filling it.
I repaired the tank with ABS glue from Home Depot. I glued the crack on the top then cut some 1/8 thick ABS and glued it over the crack and clamped it with the cheap spring clamps from Harbor freight. This fix worked very well and I did not have to remove the tank to do the repair. I will never close the valve to fill the tank again to flush it.
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