Find your parts diagram
Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
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018931F | Raypak Differential Pressure Kit For Avia 404A
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
The 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 supports reliability and extends the operational life of your heater.
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Essential Safety Monitoring: Tracks pressure differential across the heater to detect low flow or blockages—protecting against overheating or heat exchanger damage.
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OEM Quality Integration: Designed specifically for Raypak Avia Model 404A and Avia HD NiTek 404A heaters, ensuring seamless fit and reliable replacement of the factory part.
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Precision Components: Built with finely calibrated sensors, fittings, or diaphragms that respond accurately to flow changes, maintaining heater efficiency.
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Corrosion-Resistant Materials: Constructed using metals and seals suited to resist rust, corrosion, and degradation from boiler combustion environments and pool chemical exposure.
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Helps Maintain Heater Warranty & Compliance: Using authorized differential pressure monitoring keeps your heater operating within manufacturer specs, often required for warranty compliance.
- Raypak Avia 404A Heater Model 018033
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Raypak Avia HD NiTek 404A Heater Model 018045