Square D - FHG2J27CP 100 PSI Pumptrol Air Compressor Switch The Square D Pumptrol? by Schneider Electric Water Pressure Switches have been providing rugged, reliable performance for over 67 years. These switches are designed to control electrically driven water pumps and air compressors. They can be used for air compressor or water pump applications. Features Pumptrol(TM) Air Compressor Switch Suitable for air compressor applications Off at 100 psi Controls small electrically driven air compressors 1/4 in. pressure connection USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.