The use of galvanized elbows is now a kind of iron pipe connection for gas and heating. It is a galvanized elbow. The galvanized elbow is used as a water pipe connection. After a few years of use, a large amount of rust is generated inside the pipe. The yellow water flowing out not only pollutes the sanitary ware. And mixed with bacteria that grow on the inner wall of the slick, the rust causes the heavy metal content in the water to be too high, which seriously endangers the health of the human body. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes, and successively banned galvanized pipes and galvanized elbows. The Ministry of Construction and other four ministries and commissions also issued a document clarifying that galvanized elbows will be banned from 2000. At present, cold water pipes in new residential areas have rarely used galvanized elbows to connect pipe fittings. In some districts, hot water pipes use galvanized bends. Head connection.