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Vintage tennis ball pressurizer. Screw it onto a can of tennis balls and pump it a few times to keep your balls fresh and bouncy. : r/specializedtools
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Amazon.com : BALL RESCUER: Tennis Ball Life Extender – Converts Tennis Ball Containers to a 30 psi Ball Pressurizer – Needs a Bicycle Pump to pressurize (Container and Pump not Included). : Sports & Outdoors
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Amazon.com : Yinuoday Tennis Ball Pressurizer, Tennis Ball Saver Storage Box - Keep Balls Fresh Pressure Maintaining Repairing Storage Can Container Sports Accessories : Sports & Outdoors
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Tennis Ball Saver Restore Tennis Ball Pressurizer Black Tennis Ball Pressurizer Storage Canister Maintaining Repairing Container
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