Compression fittings in according to UNI EN 1254-2:2000 and UNI EN 1254-4:2000 Standards, produced in UNI EN 12165 CW617N hot forged brass and suitable for clamping copper pipes in water plumbing systems. The hydraulic-keep is guaranteed by an NBR 70 Sh. O-Ring [A] in according to DVGW DIN EN 549 B2 (-20°/+80°C), H3 Standard combined with an UNI EN 1652 brass washer [ B ] and a UNI EN12166-Cu-ETP brass snap ring [ C ]. The threads are R and Rp types in according to Standard UNI ISO 7-1:1994/Cor 1:2007.