... Stabilized Instrument The Function of Non-Return Valve. Visual Adjustable Auto Filling Valve, Water Heating Systerm, Refrigeration, Air Conditioner ... is convenient.With the function of non-return valve,hand stop valve, diaphragm is larger than the same kind ... rubberThe automatic filling valve consist in pressure reducing valve, stainless steel filter, shut-off valve and a check valve.With visual design ...