... 4"Standard: DIN, BS, ANSI, CNS, JISFits schedule 40 and 80 pipe, Color: white, grey, blue1) ... 4"Standard: DIN, BS, ANSI, CNS, JISFits schedule 40 and 80 pipe, Color: white, grey, blue1) ... increasing flow speed7) Low noise, reduced by 40% compared to galvanized steel pipes8) Soft ... excellent design, suitable for installation either exposed or hidden9) Wonderful ability in chemical corrosion resistance10) ...