Hello Fullmoon
Sorry for the delay in responding.
I just winterized the RT this week and wanted to check out the new macerator to see that it operated as it should, before I tucked her in for the winter.
As the tank had not been used since the new macerator was installed, I half filled both the black and grey tanks with water, and then tried it out. Wow...what a difference,like a fire hose now... and both valves worked as the should!! Costly repair, but definitely worth it.
I guess it's like worn brakes on your car....you don't realize how bad they were, until they are replaced!
After emptying the water from the sanitary tanks, running antifreeze throughout the entire plumbing system, including the macerator, I was a happy man!