MICROFLEX® PE-X Couplings - 6 bar. Straight coupling for use in piping systems equipped with transport pipes for heating, cold or cooling water applications. The coupling has a long supporting pipe for optimal clamping, aconical outside thread connection and a clamping ring with stainless steel bolt. Assembly instructions: see our Installation manual. Max operating pressure: 6 bar (16 bar) – Max fluid temperature: +95°C(+25°C) – PEX-a and PE pipes: SDR 11 – Supporting pipe material: CW602N – Clamping ring material: