RLS7201 wrote:
So much nonsense about check valves in water pumps. There are NO check valves in water pumps. There are inlet valves and outlet valves. Both an inlet valve and an outlet valve would have to fail for water back flow to the fresh water tank.
Richard
The definition of a check valve: "a valve that closes to prevent backward flow of liquid."
Those inlet and outlet valves you refer to are check valves.
You're right that both the inlet and outlet (check) valves need to fail or get debris in them for water to backflow but it seems to happen often enough as evidenced by the people whose issue goes away by simply using the pump.
