The Rheem-Ruud 42-105443-01 Gas Pressure Switch is a safety component designed to monitor gas pressure in compatible HVAC heating systems. It operates by detecting pressure changes and controlling electrical contacts to help ensure safe burner operation. Commonly used in compatible Rheem-Ruud furnaces and gas-fired heating equipment, this switch helps prevent operation under improper ... https://www.partshnc.com/42-105443-01-rheem-ruud-gas-pressure-switch