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