Use this in-line spring-loaded ball check valve to maintain prime in supply (suction) lines for pressurized water systems and both manual and electric head saltwater intake lines.

Helps maintain pump prime
Stops unwanted backflow of water
For use in 3/4" hose lines
Not for use on the pressure (outflow) side of pump lines
Note: shown disassembled - the hose barb/spring/ball fitting screws into the far side of the "tee" to create an in-line fitting