... half coupling 1.Size: 1/8''-6'' 2.Standard: BS ANSI DIN standard 3.Certificate: ISO 9001:2008 4. ... CLASS CSurfaceHot Dipped Galvanized, Electro Galvanized, Natural finished, Chemical blackThreadsDIN, BS, NPT, Metric, BSPT, BSP, NPS (ISO7/1, DIN 2999 ... water ,oil and electricity connection etc. Materials: carbon steel ,stainless steel ,alloy steel . Surface of screwed half coupling: cold galvanizing,hot ...