Hydro Flow®/Netafim’s Techline Combination Tee for 12 mm Drip Line Poly Tubing. Fits Techline EZ Dripperline. These tee fittings connect to 3/4 inch Female Pipe Thread and have dual barbed tubing connectors that go inside the 12 mm poly tubing. Forms a tight, leak proof connection. Operating pressure is 0 to 30 psi.