Microflex PE-X Couplings Sanitary MJ341. Straight coupling for use in piping systems equipped with transport pipes for sanitary, cold or hot water applications. The coupling has a long supporting pipe for optimal clamping, a conical outside thread connection and a clamping ring with stainless steel bolt. The included remote plate makes it easier to fit the coupling. 28/4.0 1”M 28 • Max operating pressure: 10 bar • Max fluid temperature: +95°C • PEX-a pipes: SDR 7.4 • Supporting pipe material: CW602N • Clamping ring material: CW602N