If you’re PGP heads are leaking water after the system is shut off and the flow of water reduces over time, your heads are experiencing low head drainage. Low head drainage is where the lowest heads on the line weep the water in the pipe after that valve has shut down.
You can install a check valve at the bottom of the rotor. The part number for the Filter/Screen Check Valve Sub-Assembly is 142300.
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- Unthread the body cap and remove the internal assembly from the sprinkler body.
- Turn the internal assembly upside down to access the opening in the bottom of the riser.
- Insert the large, irregular shaped end of the Drain Check Valve assembly into the bottom of the riser. The small circular rubber portion of the Drain Check Valve assembly will remain outside of the riser.
- Replace the internal assembly and tighten it into the body.
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