United States Plastic 1/4 x 1/8 in. Tube x MPT Polypropylene Coupling - 61087 - Pollardwater
Amazon.com: PureSec Push to Connect 1/4 inch Tubing Use Plastic Inline Straight Union Connector Quick Connect Fittings for Reverse Osmosis System (10, 1/4") : Everything Else
Polypropylene Plastic 1/8" Hose ID, 1/4" NPT Male Single Barb Hose/Tubing Fitting Connector
Homewerks Worldwide 1-1/4-in Schedule 40 PVC Coupling in the PVC Pipe & Fittings department at Lowes.com
Amazon.com: 40Pcs Plastic Quick Fitting 1/4 Inch Pneumatic Push Connector Pipe Tube Fitting Straight, Elbow Union, Y Union, Tee Union Connectors PU6,PV6,PE6,PY6 Parts for Air Hose : Industrial & Scientific
Everbilt 1/4 in. OD Compression Brass Coupling Fitting 801800 - The Home Depot
Amazon.com: IVLPHA Push to Connect Fitting 1/4" Tube OD x 1/8" Tube OD Reducer, Pneumatic Air Water Straight Union Two Way Connector/Coupler (Pack of 5) : Industrial & Scientific
Ptfe Plastic Tube Joint Quick Coupling Standard 1/4-28unf Eco-friendly Material New Design Various Options - Pipe Fittings - AliExpress