You may not need to change the t-valve. On my 97 Fleetwood bounder the grey and black water tanks come together, each with its own t-valve. My grey also leaked. I bought an add-on t-valve at CW which went on where the sewer hose normally goes. The hose then connects to the add-on valve. The leak no longer is a problem and I now have the capability to flush the balack tank a number of times using the grey water and manipulating the valves. Let me know if you have any problem finding the valve or understanding my approach.
AJ Theiler
