Rheem SP13845A Gas Thermostat Gas Control (Thermostat) - NG HVAC replacement part Rheem SP13845A Rheem/Ruud replacement gas control thermostat NOTE: Fits Rheem Ruud Models: 42VP40FW, 42VP50FW, 42VP75FW, PVP40FW, PVP50FW, PVP75FW, 42VP40FW, PVP40FW, 42VP50FW, PVP50FW, 42VP75FW, PVP75FW