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Use this SVRS device to meet the VGB anti-entrapment requirements for swimming pools.  SR-500 Stingl Switch (Safety Vacuum Release System) The Model SR-500 is a Safety Vacuum Release System (SVRS) which works by monitoring the vacuum on the suction side of the pool or spa pump. When a blockage occurs in the main drain or skimmer a sudden rise in vacuum will cause the SR-500 to shut down pump operation and activate an audible alarm. The pump will remain off with the alarm sounding until manually reset. Features and Benefits *Complies with ASME/ANSI 112.19.17