"Valve of Mystery" for toilet in 2011 SMB Sprinter
Does anyone know what the purpose is for this valve on the side of the marine toilet in my 2011 Sprinter SMB RB110S? I'm guessing that it might control the amount of water that each pump/flush cycle creates, but that's just guessing.
Thanks. BTW the black circle on the floor is velcro to hold a toilet brush canister.
2011 Freightliner 2500 Sportsmobile RB110S, all electric, 150k