Pentair Max-E-Therm/MasterTemp Hi-Limit Switch, 1/4" NPT (42001-0063S)

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Protect compatible Max-E-Therm and MasterTemp heaters from excessive temperature conditions with this 1/4" NPT hi-limit switch. The hi-limit switch is an important safeguard that h elps monitor heat levels and interrupt operation when temperatures move outside the acceptable range.This replacement is commonly used when troubleshooting heater shutdowns, overheating concerns, or failed safety-switch readings. It should be installed with attention to thread size, placement, and the heater’s service documentation. Hi-limit switch with 1/4" NPT configuration Helps protect against overheating conditions Supports safe heater operation and diagnostics Fits select Max-E-Therm and MasterTemp models Professional installation is strongly recommended Show more