... -welding equal-diameter and reducing-diamater bend standard:GB,ISO,ANSI ,JIS,DIN butt-welding equal-diameter and reducing-diamater bend ... /180 degree seamless an welding standard:GB,ISO,ANSI ,JIS,DIN1 size:1/2"-72"2 type : Long-radius or short-radius3 shape: equal ... : seamless or welding5 standard:GB,HGJ,SHJ,SY,DL,ISO,ANSI ,JIS,and DIN6 wall: STD ,SCH40,SCH807 Others: acquire ISO9001 ...