... .Groove as Victaulic standard 4.EPDM gaskt 5.DN15-DN500 pipe fittingNameCoupling, elbow, tee, cross, reducer, cap, mechanical tee, ... water supplying, gas supplying, heat supplying, etc.2) Industrial pipeline system on shipping, mine, oil field, textile, powder plant, ... etc.3) Pipeline system on subway station, railway station, airport, seaport, bridge, ...