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John Guest 1/4-in x 1/8-in Push-to-Connect Male Adapter (10-Pack) in the Push to Connect Fittings department at
Push To Connect Fitting Plug, Excellent Sealing 6mm Smoothly Appearance Plastic Pneumatic Tube Connector Plug Easy Install 100pcs For Industrial Accessories
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SharkBite 1/4 in. Push Fit X 1/4 in. D Push to Fit 10 ft. Brass Ice Maker Connection Kit - Ace Hardware
John Guest 3/8 in. x 3/8 in. x 1/4 in. Polypropylene Push-to-Connect Angle Stop Adapter Valve (10-Pack) ASVPP1LF - The Home Depot
3pcs Push to Connect Fittings Tube Connect 8mm or 5/16 Straight OD Push Fit Fittings Tube Fittings Push Lock Blue
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Piping and plumbing fitting - Wikipedia