PPR is the abbreviation of type three polypropylene, also called random copolymer polypropylene pipe. It adopts thermal welding method, has special welding and cutting tools, and has high plasticity. The price is also very economical. With an external insulation layer, the insulation performance is better, and the pipe wall is also very smooth, excluding the joints of the inner and outer wires. It is generally used in embedded walls or deep well embedded pipes. PPR pipes are moderately priced, stable in performance, heat-resistant, heat-insulating, corrosion-resistant, smooth inner walls, no scaling, safe and reliable piping systems, impermeable, and have a service life of up to 50 years. However, the construction technology requirements are high, and special tools and professionals are required for construction to ensure the safety of the system.