has the advantages of both metal pipe and plastic pipe, overcome the shortcomings-heat expansion of PP-R, PE, PB, PE-X pipes ... ;5, Low expansion: expansion close to the metal pipe expansion;6,Wide use: for a variety of fluid ... Anti-bacterial strength: use the T2 pure copper;Size(mm)specsdn20dn25dn32steel-plastic pipe dn20mm25mm32mmthickness of outer ppr2.8mm3.5mm4.4mm copper PP-R composite pipe ...