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Check Valve from bottles and a table tennis ball

Step 3: Assembly

prepare some epoxy mixture.

now, take the O-ring ( of you chose to use one ) and glue it ti the inside of one bottlr top. you can press it down with the table tennis ball. ( make sure you dont have any epoxy glue on the inside of the O-ring )

wait for the glue to dry.

test the seal byholding the bottle top with the cap on the bottom, placing the ball on the O-ring and trying to suck air from the cap side.
 
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