... ,diameter: 420, 455, 460, 470, 480, 500.d) Insulation layer: high density polyurethane foaming, thickness ... SRCC, Solar Keymark,SABS... ________________________________________________________________________________ Name: Non-Pressure Solar Water Heater With Auxiliary Tank(Colored Steel Series ... ,diameter: 420, 455, 460, 470, 480, 500.d) Insulation layer: high density polyurethane foaming, thickness ...