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5/8" Drip Tape End Closurehttp://images.dripdepot.com/image/52dd7c6175eb51441ae30000/360x360/drip_irrigation_parts_accessories_5_8_drip_tape_end_closure
The 5/8" Drip Tape End Closures are a nice inexpensive option. Will work with 8mil and 15 mil drip tape.
To use: Insert the drip tape into the narrow part of the fitting and extend a few inches past the larger opening. Fold over the extended end two or three times. Pull the tape back into the cap to lock it in place. Works with P1, T-Tape, Aqua Traxx, and Chapin Drip Tape Systems.