... ) Standard: ANSI B16.5, B16.47, MSS, SP-44, AWWA, API, DIN, JIS, HG, GB, JG Specifications 1)welding neck , slip - on ,socket welding ... to DN2000)5)Special designavailable as the requirements of customer6)Standard: ANSI B16.5, B16.47, MSS, SP-44, AWWA, API ... ASTM, BS, DIN, JIS, EN, GB and customer's request. socket welding stainless flanges