Re: Doin some work today on Jeff's coach
Reply #11 –
It allows you to close the new third valve, and then use the grey water to get free back flush of the black tank. I can do it a number of times before there is little grey left to dump. Also, if ever the black or grey valve were to fail or leak, you still can shut off the third and continue your trip.
I carry a removable third valve, and have options now.