Square D FSG2J21BP Water Pump Pressure Switch, 30-50PsiFor over 65 years, Square D Pumptrol FSG Pressure Switches have been used to monitor and control electrically driven water pumps. A long time industry standard, many more Square D brand switches are installed on pumps than any other switch available on the market today. You can trust that Square D products will to do the necessary job every time. Pumptrol switches are readily available throughout the world. Unlike many imitations, you can find