Grooved coupling,UL LISTED& FM APPROVED Ductile Iron Grooved Pipe Coupling and Fitting/Grooved Tee/Mechanical Tee /Mechanical Cross Threaded Out,1.Perfect painting on the surface for rust-proof 2.Perfect shape with standard radius of curvature. 3.Carefully dealing with the bevelled ends. 4.Clean and standard welding seam with 100% nondestructive inspection. 5.Adequate products in stock. High quality SCH 160 A860 WPHY70 elbow 45 6.Perfect package makes sure all products stay well during transportation. Grooved couplings are wildly used in various fields as follows:1.Automatic sprinkler system for Fire Fighting Protection on Commercial,Civil and Municipal constructions like water supplying,gas supplying,heat supplying,drainage,airconditioning etc. 2.Inductrial pipeline system on shipping,mine,oil field,textile,power plant,paper making,beverage and steel making etc. 3.Pipeline system on subway station,railway station ,airport,seaport,bridge,channel etc.