... 3. Standard: ANSI,ASME,DIN,API,ASTM grooved pipe fittings 90 degree elbow Ductile Iron Grooved Fittings With ... zinc, impregnating, dacromet processing according to different environments3. Pipe installation fast and convenient,allow a certain degree of ... connect steel tube, brass pipe, stainless steel pipe, aluminum-plastic composite pipe, coated steel pipe, ductile iron pipe.6. Fire piping system ...