Double drain valve? Do you mean a 3” termination with an 1 1/2” tee?
You’ll need to know not only the dimensions of the tank, you also need to know where the drain is. You can start here:
https://www.recpro.com/rv-black-wate...olding%20Tanks
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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