The pipe diameter is usually Dn150 and below. The anticorrosion measures are mainly plastic pipe, aluminum or copper plastic composite pipe and galvanized steel pipe. The plastic and aluminum or copper compound pipe can be anticorrosion naturally. The connection of the galvanized pipe can be connected by wire buckle. The wire buckle can be processed by the manufacturer and can be galvanized after processing; it can also be added on the spot. Work and shred, paint on the thread at the corrosion, mainly brush powder.