I am building a wastewater system for my van (ie low pressure) and would like removable tanks for ease of emptying. I can shut off the inlet but would like to be able to drop them and automatically have them seal once the inlet is no longer connected. Lifting them back into position, the male inlet pipe pushes open the valve to allow flow to resume. Grey water only, no solids.
It's some kind of spring loaded valve but it needs to open with the mating of pipes and not water pressure. Probably, it doesn't have to be anything more than splash proof so no problem with seals. Right now, I can't even find the right term to look up.