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018931F | Raypak Differential Pressure Kit For Avia 404A Skimmer Lid For Pentair Swimquip U-3 Skimmer How do I confirm theThe Raypak 018931F Differential Pressure Kit is a critical component for Avia 404A gas fired pool & spa heaters. It measures and monitors pressure differences across key flow paths to ensure optimal heater performance and safety. When properly installed and functioning, it helps detect low flow or blockage conditions and allows the heater to shut down or alarm before damage occurs. Made from precision parts engineered to OEM standards, this kit