Pentair Heater Dual Relay Kit | 520403 AquaPro Replacement shield kit designed for

Replacement shield kit designed for the Napoleon GD-303

Ultra fine options are used when pools experience heavy dust or sediment

Replacing worn straps helps maintain proper cleaner positioning and protect pool surfaces

Proper sealing reduces repeat service calls

It is designed for Purex C System Go-Kit components and is not described for universal compatibility

Pentair Heater Dual Relay Kit | 520403 AquaPro Replacement shield kit designed forWhat This Part Is Used For Pentair 520403 Heater Dual Relay Kit is a replacement relay kit used in compatible Pentair heater control systems. It manages power distribution within the heater assembly. Why This Part Matters A faulty relay can prevent heater startup or cause intermittent operation. Replacing the dual relay kit restores proper electrical switching. Reliable relay performance supports consistent heating cycles. Key Features and