... , AWWA, API, DIN, JIS, HG, GB, JG Specifications 1)welding neck , slip - on ,socket welding , blind. 2)ASTM A105,DIN ST37 ... .2,ASTM A182-F304 F304L 3)ANSI B16.5,BA105,DIN ST37.2, ASTM A182- F304 ... , API, DIN, JIS, HG, GB, JG, BS.7)All the flanges are according to the ASTM, BS, DIN, JIS, EN, GB ...