1. Press-(cold pressed): stainless steel joints, special calipers clamping, suitable for connection with various diameters.
2. nested (threaded compression mode): cast copper connectors, threaded compression, removable, pipe connection for tube diameters less than or equal to 32.
3.-screw extrusion: cast copper connectors, joints and piping between the plastic seal, the conical seal in the form of nut extrusion shall not remove, pipe connection for tube diameters less than or equal to 32.
4. transitional: Aluminum-Plastic compound pipe and other pipe, metal fittings, valves, sanitary appliances connections, use copper wire or copper wire adapters, pipe thread connections.