HOW TO – Make a check valve from bottles and a table tennis ball

Science
HOW TO – Make a check valve from bottles and a table tennis ball

Make 447
Harari writes –

Ever wanted to presurize your water bottle rocket and couldn’t find anything to stop the air from going out? Ever wanted to transfer water or air from one place to another the easy way ? well you better try this !

HOW TO – Check a valve from bottles and a table tennis ball – Link.

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