The black iron pipe is made of steel which is equivalent to a galvanized iron pipe, only the galvanized iron pipe is added zinc while the black iron pipe is not supplied with anything extra.
Pipes are used to drain various fluids either liquid or solid. Article on other requirements, this is the producer producing various types of pipes to meet consumer needs. Starting from its size to raw materials, the making of various other fluid articles cannot be accommodated by an equivalent pipe.