Pentair Automatic Gas Shutoff Switch (AGS) | MasterTemp & Max-E-Therm Heaters | 42002-0025S C7470 cross-reference the part number printed

cross-reference the part number printed or molded on your existing union adapter body — PKG 188Z covers the 2-inch configuration for both the System 3 filter and MasterTemp heater lines

Chlorine Resistant: Specifically formulated to withstand the chemical balance of treated pool water

Bottom Cap: 1-1/2" male thread/MPT

New spa setups (remove phosphates from fill water)

Pentair Automatic Gas Shutoff Switch (AGS) | MasterTemp & Max-E-Therm Heaters | 42002-0025S C7470 cross-reference the part number printedThe Pentair Automatic Gas Shutoff Switch (AGS) (42002 0025S) is the OEM replacement safety switch for Pentair MasterTemp and Max E Therm pool and spa heaters. IMPORTANT: LICENSED PROFESSIONAL INSTALLATION 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. IMPORTANT: QUANTITY REQUIRED PER