Good value on a double union check valve. By Mr. Biggs on 12/16/2009
Mr. Biggs would recommend this product to a friend
Does what it was made to do prevent the back flow of water.
The unions make it handy for cleaning and replacement when it fails.
All check valves are subject to failure in the long run.
I would not depend on a check valve to prevent the draining of the main tank into your sump to prevent flooding. Design the sump to hold all the water that will drain from the main tank during pump or power failure.
This valve is a good value and I would recommend it to others when used in the right situation.