Cart Pressure Switches Designed for the control of electrically driven water pumps. View cart “1/4″ Female NPT Square D Pressure Switch, 20 – 40 PSI” has been added to your cart. Showing all 4 results Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low 1/4″ Female NPT Square D Pressure Switch, 20 – 40 PSI $38.46 Add to cart 1/4″ Female NPT Standard Duty Pressure Switch, 20 – 40 PSI $16.69 Add to cart 1/4″ Female NPT Standard Duty Pressure Switch, 30 – 50 PSI $16.69 Add to cart 1/4″ Female NPT Standard Duty Pressure Switch, 40 – 60 PSI $16.69 Add to cart