Used to cap off the end of your drip tape. Works with both 8 and 15 mils, made of high quality UV resistant plastic. Recommended operating pressure 10 psi. Maximum operating pressure 15 psi. Minimum operating pressure 4.4 psi. Insert Tape into the narrow, end so that it sticks out of the other end a few inches, fold the end over a few times, then pull back on the tubing to lock it into place.