can you make a homemade butterfly valve?then you could have like a 3"valve with nothing stopping flow apart from 1cm thick piece of pvc.
could you use something else other then pvc pipe as the flap that turns?
i was thinking a metal lid to this chocolate milk powder stuff ive got but not sure how much pressure it would hold.
i dont know if this would work so dont go all ape on me saying its the worst idea youve heard.
edit:i just thought of using a 2" end cap like some piston valves use i believe.
