100 x Dash 109 Buna-N O-rings  Dash 109 are the size for dip tube gaskets for most pin and ball lock kegs.  See: Bulk Keg O-rings and Keg Repair Part Numbers for more information.

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Important Note: Although these are the right size standard ball lock and pin lock dip tubes, they aren’t necessarily appropriate for use with homebrew kegs.  As of this update they are not marked as appropriate for food use.  If you’re looking for food grade, o-rings, which I think you should be consider: Food Safe Dip Tube O-Rings – Complete Lineup

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109 Buna-N O-Ring, 70A Durometer, Black, 5/16″ ID, 1/2″ OD, 3/32″ Width (Pack of 100) – note that multiple variations of this product may be available, as such a different version may appear at this link

Also: Kegerator Tips & Gear | Keg Repair Part #s | Recent Keg Finds

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Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.  prod:B000FMYR9S