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Check valves allow one directional water flow and are used to prevent back flow and siphoning. These are among the highest quality check valves to be found. Relative to other types and manufacturers of check valves, these valves create minimal pressure loss. They are commonly used on return pump outputs to prevent water overflowing the sump in the event of a power outage, pump failure or maintenance.
The true union check valve is specially designed to be disassembled by unscrewing the nuts in line leaving the tail pieces solvent cemented to the pipe. This true union allows you to remove the body for repairs, or cleaning, even providing the opportunity to change the body or spring.