One way valve for 1/2" pvc (used for manual water pump)

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I Used A Hot Glue Gasket, Much Like This One Https://Www.Thingiverse.Com/Thing:1653180 To Aid The Seal, But It Works Great For My Applications. ... I Made An Air Powered Water Pump Using Two Of Them In A "H" Configuration (See Post Printing) It'S Not Quite 100% But It Still Works Wonderfully. Great For Teaching Kids How Pumps Work

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