Rain Bird Barbed x Barbed Flex Pipe Coupling in the Flex Pipe Fittings & Risers department at Lowes.com
Amazon.com : iRunning Drip Irrigation Fittings Kit for 1/2 Inch Tubing, 20 Pieces Drip Irrigation Parts for Drip Sprinkler System - 8 Couplings, 6 Tees, 6 Elbows, Drip Line Connectors for 1/2"
Sprinkler Parts — Sprinkler Supply Store
Apollo 1 in. Barb Insert Blue Twister Polypropylene Telescoping Poly Pipe Repair Coupling Fitting ABTSLC1 - The Home Depot