The Compression Elbow Coupling, Like Claber, Enables coupling of two 1/2 inch, 13mm/16mm main tube sections. Features a unique Anti-Leak locking system, a method of locking the pipe tight to the fitting to eliminate leaks and high-pressure blowouts. They work in the same manner as the MDPE compression fittings used in standard plumbing practices. Irrigation fittings.