PP pipes are a non-toxic, hygienic, high-temperature resistant, and recyclable tubing, primarily used in indoor cold and hot water supply systems for buildings and also widely applicable in heating systems. The features of PP pipes include resistance to corrosion and abrasion, non-scaling, vibration and noise reduction, frost crack prevention (PP pipes can crack at temperatures below -20°C, decomposition occurs at temperatures above 70°C in high-temperature environments, and they are suitable for temperatures between -20°C and 70°C), condensation prevention, low heat loss, easy installation, and long service life. The connection methods include welding, end welding, and different material joints.