1.pipe fitting FM/UL approved 2.Materail: ductile iron 3.Groove as Victaulic standard 4.EPDM gaskt 5.DN15-DN500 pipe fittingNameCoupling, elbow, tee ... system on shipping, mine, oil field, textile, powder plant, etc.3) Pipeline system on subway station, railway station, airport, seaport, bridge ...