When the PPR pe fittings are connected with the metal fittings, the PPR pipe fittings with metal inserts shall be used as the transition. The pipe fittings and the PPR pipe fittings shall be connected by the hot-melt socket method. When they are connected with the metal fittings or the hardware fittings of the sanitary ware, the threaded connection shall be used, and the polypropylene raw material belt shall be used as the sealing filler. If the tap is connected to the mop pool, install the internal thread elbow (internal thread) at the end of the PPR pipe fitting on it. During the pipeline installation, do not use too much force to avoid damaging the threaded fittings and causing leakage at the connection. Special pipe shear can also be used for pipe cutting: the bayonet of pipe scissor shall be adjusted to be consistent with the cut pipe diameter, and the force shall be evenly applied during rotation cutting. After cutting, the fracture shall be rounded with a matching rounding device. When the pipe is broken, the section shall be vertical to the pipe axis without burr.