Quickun 5/16" Hose Barb Fitting Plastic Equal Barb Joint Splicer Mender Adapter Union for Tubing Pipe Air Line (Pack of 5): Amazon.com: Industrial & Scientific
uxcell PVC Barb Hose Fitting Connector Adapter 6mm or 15/64" Barbed x G1/8 Male Pipe 2pcs - Amazon.com
Plastic Fittings - Hose Barb Y Connectors 3/8 in.
Amazon.com: Quickun 5/16" Hose Barb Fitting Equal Barbed T Shaped Tee Type 3 Way Plastic Joint Splicer Mender Union Adapter for Air Line Tube Hose (Pack of 5) : Industrial & Scientific
Male Thread x Barb Plastic Tube Connectors - Plastic Tube Connectors - Plastic Tube Fittings - Plastic Fittings