Introducing the latest innovation from Drip Depot: Twist-N-Lok reusable fittings tailored for 1/2" (.600 ID x .700 OD) poly tubing, offered in a range of sought-after fitting configurations.The Twist-N-Lok Tubing End Cap is the ideal solution for sealing the end of a tubing run.It's simple to install: rotate the Twist-N-Lok collar inward to reveal the barb. Slide the tubing onto the barb as far as it can go. Then, rotate the Twist-N-Lok collar outward over the tubing to establish a watertight connection, ensuring a leak-proof seal.