Precise Metering: The #40 drill size provides a consistent 0

if your compression spring is corroded or lost tension

When performing a head mechanism replacement or annual inspection

this limit switch is used across various platforms

Robertshaw 190-068 Plastic Guard Precise Metering: The #40 drillPrevent unauthorized adjustments and maintain precise climate control with the Robertshaw 190 068 Plastic Guard (BTG UK). As a heavy duty rectangular thermostat guard, this kit is engineered for high traffic commercial environments where tampering can lead to significant energy waste and equipment strain. The transparent thermostat cover is constructed from high impact plastic, allowing for clear visibility of settings while providing a rugged