vatac SW flanges, Socket Weld Flange, ISO/CE/API Approved Size: 1/2"~80" ... Material: C.S, S.S, Duplex Rating: CL150~CL2500 VATAC SOCKET WELDED FLANGE SERIES ARE WITH FEATURES AS BELOW:Size Ranges ... /T21635, HG/T21631, MSS SP-43, DIN 2605, JIS B2313. Socket Welded Flange