Stringl-Switch Safety Vacuum Release System that monitors vacuum levels on the influent side of the pool or spa pump. It readily switches off the pump operation and sound off an audible alarm when high vacuum, possibly caused by drain/skimmer blockage, has been detected.
It features a 30-minute Maintenance and Cleaning mode where the Stingl-Switch will be deactivated for the pump to be allowed to run under high vacuum conditions.