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PC4-01 Push to Connect Fittings, 4mm Tube OD x 1/8” G Thread, Straight Pneumatic Quick Fitting Air Line Connector 20Pcs: Amazon.com: Industrial & Scientific
Barb Drip Tee Pipe Connector 4mm and 8mm Inner Diametermm Hose Fitting for Garden Irrigation System, Plastic 15pcs - Walmart.com
Amazon.com: 4mm Quick Fitting, 5/32” OD Push to Connect Pipe Tube Straight Fittings, Pneumatic Air Line Connector 20Pcs : Automotive