Wafer Non-Return Valves are made for vertical installation only. C & R [Sales & Services] Pvt. Ltd. Manufactures Wafer Non-Return Valves. C & R [Sales & Services] Pvt. Ltd. Also manufactures different types of Valves. Wafer Non-Return Valves are available with maximum working pressure of 10 kg/cm sq. The disc is mild steel epoxy coated. It also comes with nitrile rubber O-ring. Its maximum working temperature is 80°c.