Size of holding tank valves/gates

[2Wanderers]

I have a 2010 Mountaineer. Does anyone know what size gaskets I need to have on hand to replace old worn out valve/gate gaskets. I am guessing black is 3 inch, but I don't know size of gray (shower and sink). I would like to have the right ones on hand before I drop the undercover. I guess after replacing the gaskets add a little plumbers lubricate and I should be good to go?

[Carl n Susan]

If it is anything like the Montana (and I believe it is), the shower tank is 3" and the galley tank is 1 1/2".

[beeje]

I agree with carl and Susan. Mine were that size. I just replaced all of my valves and cables with Valterra valves. If I was you I would not just replace the seals. The stock valves (mine were Bristol) are junk compared to the Valterra valves. You have to take them all apart anyway to get to the seals.

If your unit is like mine (Montana 3455sa) the cables were routed horribly. Either too short or long and not anchored at all. Very sharp bends Etc.

I had to use all my might with both hands to open and close the black valve. Now I can do that with 2 fingers.

[CaptnJohn]

My 2017 HC arrived with Valterra valves. Time will tell if installed properly.

[airboatart]

I agree. when my seals went bad i replaced all my valves with Valterras