does the collective have any idea what these type of non-return valves are called? I’ve a couple in my pump out system that are getting very tired and I wanted to google some new ones.
Thanks.
Swing Check valve and the orientation is important.
Swing Flap Check (Non-Return) Valves - Johnson Valves
Don't swing check valves usually have the flap held on a metal hinge? The OP's photo shows an all-rubber hinge, like the ones on marine toilets.
It's a marine toilet one and so far all I can find is some for bagpipes!![]()