Harwil HRQ12D Flow Switch 1/2" Mpt Long Stem Pilot Duty SPNO Washer and other Pentair filter models

and other Pentair filter models using 2-inch bulkhead fittings

It is not a drop in replacement for auxiliary pumps identified as pump 2

Pentair 4000 Series filters

It helps manage motor operation and is intended for use as a direct service replacement when the original board fails or becomes unresponsive

providing optimal performance and extended filter cycles for residential pools and spas

Harwil HRQ12D Flow Switch 1/2" Mpt Long Stem Pilot Duty SPNO Washer and other Pentair filter modelsHarwil HRQ12D Flow Switch 1 2" MPT Long Stem, Pilot Duty SPNO Reliable Flow Detection Ensures accurate water flow monitoring, protecting pumps, heaters, and critical hydronic equipment in pools, spas, water heaters, and boilers. 1 2" MPT Long Stem Design Male pipe thread for direct inline installation; extended stem for deeper pipe runs and retrofit needs. Durable & Versatile Built for continuous operation in wet environments. Suitable for commercial