Abstract: A sprinkler head shutoff valve for use with underground lawn sprinkler systems includes a central housing including a lower water inlet port and an upper water exit port. The lower water entry port may include a threaded male fitting for threadedly engaging a conventional plastic tee or elbow connector of the type often used in underground sprinkling systems. The upper water exit port includes an internally threaded female fitting for engaging a conventional plastic riser tube interconnecting the shutoff valve to a sprinkler head. A spring-biased plunger is disposed within the housing for engaging a gasket encircling the water exit port to seal off the flow of water therethrough. A rod having a length slightly greater than that of the riser tube is inserted within the riser tube and depresses the plunger for allowing water to flow to the sprinkler head.