The set consisting of 8 bolts – 8 nuts – 16 washers is used to make the connection between the flange that slides on the HDPE flange stub end and the gate valve or ball valve flange. The bolt length does not allow connection with wafer type butterfly valves. Technical specifications: galvanized hexagonal head bolt: Class 8.8, DIN 933, ISO 4017, STAS 4845. Galvanized hexagonal nut: Class 8, DIN 934, ISO 4032, STAS 4071. Galvanized flat washer: DIN 125, ISO 7089, STAS 5200/4.