From bigclivedotcom.

Just a quick video showing the inside of a fairly common inline one way valve for some liquids and gasses.

This valve came from eBay. Its body is made of aluminium, but the interior is plastic/rubber, and will only be compatible with some liquids and gasses. It also does require a suitable reverse pressure to close properly.

I got it to test its ability to hold against a slight vacuum, and it seems to work OK for that.

If you want to open the valve it does require being gripped in a vice and a suitably sized or adjustable spanner/wrench used. They are supplied closed very tightly against the internal seal.

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