Dump Valves

I had an impossible fit to remove and replace either valve. The piping was, obviously completed and the trailer built around it. As several have suggested, the best solution is, or was for me, to hacksaw both, the black water and gray water lines, removed the valve assemblies and reinstalled them with rubber couplers after replacing a bad blackwater valve.

Found that the manufacturer had allowed glue to leak into the valve, preventing complete closure.