Product description The Control Valve – as part of the GARDENA Sprinklersystem – is used to manually regulate or shut off individual pop-up sprinklers or entire groups of sprinklers. The water supply can be continuously adjusted or completely shut off. The spherical cover disappears inwards when opened, thus posing no problem when mowing the lawn. The wide rim prevents grass from growing into the cover. A removable filter prevents contamination of the interior when the cover is open. The GARDENA Control Valve has a 3/4” male thread.