PP-R inner wire. 25ppr inner wire refers to PP-R inner wire tee, which refers to PP-R pipe, also known as three-type polypropylene pipe, random polypropylene pipe or PPR pipe. It is energy-saving and material-saving, environmentally friendly, lightweight and high-strength. , corrosion resistance, smooth inner wall without scaling, easy construction and maintenance, long service life and other advantages. The two ends are interfaces, and the tee with the inner wire interface opened in the middle is a PP-R pipe. Most household drinking water pipes in daily life are PP-R pipes.