Applications: Isiflo Ductile irons are end-load resistant for PE, PEX and PVC pipes. Couplings exist in dimensions 75, 90, 110 and 160 mm. Couplings are covered with Rilsan, a strong coating which avoids corrosion. Material: · Couplings from 75 mm til 160 mm are produced in ductiliron GGG 50. · Bolts and nuts are made of acid proofed steal A4. · The O- ring is made of NBR.