These nickel-plated fittings are produced in UNI EN 12165 CW 617N hot forged brass and are designed for patching galvanized iron pipes. The mechanical seal is guaranteed by a conical toothed and cutted ring [ C ] and the hydraulic-keep is guaranteed by a conical-trunk NBR 70 Sh. [ A ] gasket combined with a chrome-plated brass washer [ B ].