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
Masterflex® Fitting, Nylon, Elbow, Hose Barb to Threaded Adapter, 1" ID x 3/4" NPT(M); 10/PK | Avantor
Parker Hannifin 325HB-8-12N Par-Barb Nylon Male Connector Fitting, 1/2" Hose Barb x 3/4" Male NPT, White: Amazon.com: Industrial & Scientific
Plastic Barbed Insert Fittings for Polyethylene Pipe