Amazon.com: 5 Pack 1/2" Drip Irrigation Fittings, Lock Barbed Tee Connectors, 1/2 inch T Connectors for Tubing(1/2" ID x 0.65" OD), Anti-Drop Straight Tee for Irrigation Tubing : Patio, Lawn & Garden
Amazon.com: (5-Pack) 1/2" Universal Nut-Lock Tee Drip Irrigation Tubing Compression Fitting Connector (Fits All Tubing .530, 600 and .620 ID (16, 17, 18 mm) - (Tee 5-Pack) : Patio, Lawn & Garden
10-Pack) Drip Irrigation Tubing 1/2" Universal Shut Off Valve - Perma Connector Barbed Locking Fitting - Fits All Brands 16-17mm Drip Tape AG Tubing (10, Shut Off Valve) - Walmart.com
Amazon.com: One Stop Outdoor 20-Pack - Irrigation Fittings Coupling for 1/2" Drip Tubing - Barbed Connectors (Fits Most Brands, Rain Bird 16mm .520 ID and Compatible Drip or Sprinkler Systems) (Coupling 20-Pack) :
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"
Amazon.com : YOUHO Garden Hose Adapter 1/2" Drip Irrigation Tubing to Faucet - Reusable Connector Fittings for Most Rain Bird, Orbit, Dig, Toro 7/16 or 1/2 Tubing x 3/4" FHT Garden Extension