2011 Best Steady ppr check valve green With German Standard Green, gray, ... :DIN 8077/8078 OEM acceptable 2011 Best Steady ppr check valve green With German Standard1, raw material: ppr ... smooth inner wall surface,reducing the pressure loss and increasing the flow speed12, low noise,reduced by 40% compared to galvanized ... OEM is also welcomed. 2011 Best Steady ppr check valve green With German Standard