Features: 1.Adopting the specialized extruder for glassfiber reinforced plastics, double metal screw and barrel, it ensures high speed extrusion and long service life of extruder. 2.Special designed co-die head ensures even thickness of three layers, each of them can be adjusted freely. 3.Adopting the imported PLC computer control system, it ensures control precision and automatic and continues production. 4.In comparison with common PP-R pipe, the product has features of high compressive strength, no-deformation under high temperature, no-bending and extreme small longitudinal shrinkage rate, completely solving the serious defect of deformation of PP-R pipe after transmitting hot water.