Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S) covervalet Invensys hi-limit sensor with 5/16

Invensys hi-limit sensor with 5/16 inch diameter and 36 inch capillary

It is a targeted repair choice for pools where the cleaner body is still usable but internal action has declined

The model-specific fit across supported Versi-Heat systems helps make this a cleaner and more confident replacement choice

This model is especially useful when you want to preserve the original threaded plumbing format instead of adapting the installation around a different connection type

Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S) covervalet Invensys hi-limit sensor with 5/16Help the heater verify proper airflow before ignition with this air flow switch for compatible Max E Therm and MasterTemp systems. The switch is part of the safety and control sequence, confirming that the combustion air system is operating before the heater continues through startup. A failing air flow switch may contribute to ignition problems, shutdowns, or diagnostic issues when the blower and venting system are otherwise serviceable. This