Hexagonal nipple with conical thread DIN 2990 3171 name ...
APPLICATION:Where there is a need for corrosion proof couplings. CONSTRUCTION AND QUALITIES: Made of acid resistant steel SIS 2343, the pipe parts have as standard Whitworth pipe threads according to ISO 7 (DIN 2999). Outside they have cylindrical threading dimensioned in ISO 228 (DIN 259). Inside threading on the hexagonal nuts, couplings nuts and extension .