Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S) covervalet A module like this is

A module like this is useful because it helps manage key heater functions

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

This type of replacement is especially useful when the housing remains serviceable and the need is centered on the cartridge alone

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

Supports proper fit

Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S) covervalet A module like this isHelp 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