APPLICATION: For use in sprinkler heads where low head drainage is a problem.
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.