... welding and seamless);1/8''-4''(Threaded and socket-welding);16''~72''(Welded)Wall thicknessSCH10,SCH20,SCH30,STD,SCH40,SCH60,XS ... ISO,API,CERTIFICATED MANUFACTURER tee for pipe fitting, pipe fittings. The mainly are used to branch pipe place of the mainpipe line,it divided ... with used in the place owned branch pipe fittings , for its easy to use simple, widely used.in chemical,civil construction ...