Replacement Low Water Pressure Sensor Switch for Ideal Boilers (175596). This is a brand new, premium quality replacement low water pressure sensor switch for Ideal boilers. It serves as a crucial safety device designed to monitor the water pressure within the boiler system. This switch helps prevent damage caused by low water pressure (which can lead to overheating and potential system damage), prevents dangerous situations, and triggers an automatic shutdown when low water pressure is detected, thus preventing further operation and damage. Specifications: Part Number: 505.91512 Equivalent Part Number: 175596 Pressure Range: 0 to 4 bar (0 to 400 kPa).