Pentair Air Flow Switch | MasterTemp & Max-E-Therm Pool Heaters | 42001-0061S C9494 inspect the strainer cover and

inspect the strainer cover and lock ring threads for hairline cracks each time you service the basket — early replacement prevents air ingestion and loss of prime

Then wake up the next day to an algae-free pool that still has a chlorine reading

or o-rings

This is the product of choice in areas with hard water problems

Pentair Air Flow Switch | MasterTemp & Max-E-Therm Pool Heaters | 42001-0061S C9494 inspect the strainer cover andThe Pentair Air Flow Switch (42001 0061S) is the OEM replacement air flow switch for Pentair MasterTemp and Pentair (formerly Sta Rite) Max E Therm pool heaters. IMPORTANT: HEATER COMPONENT LICENSED TECHNICIAN 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. The air flow switch monitors