Copper pipes are classified as follows:

1. According to function: divided into casing joints, reducing joints, 90° elbows, 45° elbows, tee joints, reducing tee joints, four-way joints, reducing four-way joints, live joints (valve conversion to joints), flanges, pipe clips.

2. According to the connection method: it is divided into socket welding, threaded connection, flange connection and new quick connection.

3. According to the material: divided into copper, brass, bronze.

4. According to the purpose: divided into water pipe fittings, air conditioning pipe fittings, refrigeration pipe fittings.