250B-06-LS or 250BV-06-LS fittings for drip tape and 1/2" poly tubing.
Apollo 3/4 in. Barb Insert Blue Twister Polypropylene Coupling Fitting ABTC34 - The Home Depot
Insert Tube fittings for soft plastic tubing installation method
Polyethylene T-Type Barbed Tubing Connectors (Tee-Shaped), Three 3/8 Inch Barbs,(Pack of 10): Amazon.com: Industrial & Scientific
Amazon.com: PureSec 3/8 Water Line Fittings 3/8 Push to Connect Fittings for 3/8 OD Tubing(3/8 Ball Valve+3/8 T fitting+Y+L+I, Pack of 10) : Industrial & Scientific