Coupling may be used for water temperatures not to exceed 110°C. Coupling shall be self centering and shall engage and lock in place the grooved or soldered ends of pipe and piping fittings in a positive watertight coupled. The couplings shall provide some degree of angular pipe deflection, contraction and expansion. The coupling clamp shall be malleable iron conforming to ASTM A536, Grade 65-45-12. The gasket shall be call-out, number suitable to a dual service piping system with a water temperature range between10 °C and 110 °C. Preferred Brand : Please specify if any