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I’ve made a similar kind of valve before for Venus using a patch of round rubber and a bolt. But the best valves I have found are duck bill valves which you can buy on Ebay: https://www.ebay.co.uk/itm/302841651412

Slightly harder to fit to an endcap, but if you have a 3d printer you can make these:

Single Valve endcap

Double Valve endcap