... ) Size from 1/8"- 6" 4)Surface:black.galv Steel Socket Merchant Coupling Galvanized, black 1. Professional Factory 2. Certificate: ISO ... , CLASS CSurfaceHot Dipped Galvanized, Electro Galvanized, Natural finished, Chemical blackThreadsDIN, BS, NPT, Metric, BSPT, BSP, NPS (ISO7/1, DIN 2999, ANSI ... terns basis Hot Product- Carbon Steel Sockets/Merchant Coupling in BS, DIN, ANSI, JIS Standard