Pentair Heater Dual Relay Kit | 520403 AquaPro This component is a floor

This component is a floor return fitting assembly used to return filtered water into the pool or spa through the floor return path

Add the contents to spa water after use or as part of regular maintenance

The Tecmark Pressure Switch 3903-EADE is a must-have for spa owners looking to maintain a consistent and safe water pressure level

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

Automation systems rely on stable communication between remotes and controllers

Pentair Heater Dual Relay Kit | 520403 AquaPro This component is a floorWhat 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