Hayward Pressure Switch for FD Series Heaters | FDXLWPS1931 Return / Inlet Fittings Always lubricate this O-ring style

Always lubricate this O-ring style plug before installation

The 356904Z includes the Keypad Relocation Cable and a Blank Drive Cover

inspect the surrounding pool wall surface and the skimmer body flange for any cracks or deterioration

Controlled Release Technology (CRT) ensures optimal mineral levels with no staining

confirm your filter model number on the label affixed to the filter tank body — the FNS Plus is available in multiple square footage configurations (36

Hayward Pressure Switch for FD Series Heaters | FDXLWPS1931 Return / Inlet Fittings Always lubricate this O-ring styleThe Hayward Pressure Switch (FDXLWPS1931) is the OEM replacement water pressure switch for Hayward FD Series pool and spa heaters. IMPORTANT: PROFESSIONAL SERVICE REQUIRED Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high voltage components without proper certification. This pressure switch monitors water flow conditions within the heater and