The ¾ in. x 18 in. SharkBite Flexible Coupling is the easy solution for joining copper, CPVC and PEX pipe without welding, clamps, unions or glue. The ideal solution for quick repairs. Simply insert the hose and the stainless steel teeth 'bite' to ensure a secure connection, while a specially designed O-ring compresses for a rock-solid seal. Uncoupling is just as fast with the easy uncoupling tool — so fittings and valves can be easily changed and reused. Even when assembled, they can be rotated for easy installation in tight spaces. SharkBite fittings are certified for potable water supply and hydronic heating applications. SharkBite: The solid choice for your next plumbing project.