Dale,

FYI... My black valve was hard to pull. I drained the tank and rinsed real good a couple times. I then removed the 4 bolts that hold the blade in place and was able to move the blade box around and lube it with silicone. I think it could easily have been removed from the plumbing, but I didn't need to go that far.

This is only for our vintage CC's, as the plumbing is fixed and glued in place, but the knife valves can be moved around and/or removed I believe for replacement.

Or, call Jdub, he is the resident stink expert!