Permaloc TL-A2-TV5B250 5/8" Tape Barbed Takeoff Valve. Use to connect 5/8" drip tape to mainline poly tubing. After laying mainline tubing along the head of the area to be irrigated, use a punch tool to make a hole in the location where each line of drip tape is to begin. Insert the barbed end of the reducer into the poly tube and attach the tape to the large end of the reducer.