Raypak 018931F Differential Pressure Kit for Model 404 The Raypak Differential Pressure Kit for Model 404 (018931F) is designed for Raypak's Avia Gas-Fired Pool and Spa Heater. Compatibility: Specifically for Raypak Model 404. Function: Monitors and controls the pressure differential in the heater to ensure optimal performance and safety. Installation: Typically involves integrating the kit into the existing heater setup.
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