What is the ductile cast iron pipe
Have not heard of the nodular cast iron pipe pipe, ductile iron may be a tube or a certain short tube is referred to as excellent grade.
Cast iron pipe is called a coiled pipe, one is the mouth, and the other is the flange. It is often used in the joint of the cast iron pipe valve, and is often used in conjunction with the second pipe (plug pipe coil)
Should not have this conceptI make the ductile iron pipe, haven't heard of this thing only ductile iron pipe, ductile cast iron heard tube
