Size of black and gray valves

[Pattifab]

I'm trying to verify the size of the black and gray tank valves in my 2011 3400RL. I know the black is 3", and I have two gray tanks, one being a 3" and the other is a 1 1/2", I'm not sure which is which. I think the bathroom gray is 3" because it dumps directly horizontal to the black tank, and the kitchen valve handle is in a different location, which I assume is the 1 1/2". I can't get down under the RV to look, because I may not be able to get back out..LOL! Would also like to know if anyone has installed the Valterra E1003VP EZ Valve 3" Electric Waste Valve System on this unit, and if so, how hard it was to install and how well it works. My husband always handled all of this, but I lost him to cancer 5 months ago, so it's all on me now. And I am so tired of dealing with these tank issues, which has been ongoing for 9 years. Thanks!

[Carl n Susan]

You do have two 3" valves (black and shower tank) and one 1 1/2" one (kitchen). Sveral members haave replaced them with electric valves. A Search would uncover more information.
https://www.montanaowners.com/forums...lectric+valves
https://www.montanaowners.com/forums...lectric+valves

[beeje]

Yes, the 2 tanks up front have 3" valves and the galley tank over the axles has a 1 1/2" valve. I replaced all mine with Valterra valves several years ago and are still working great.