Carrier HH18HA499 Limit Switch dryseal taper pipe threads are

dryseal taper pipe threads are specifically engineered to minimize potential leak paths and provide extra clearance for tightening your flare nuts in tight evaporator or condenser compartments

Which Series use this specific gasket

LP conversions require significantly smaller drill sizes due to the higher energy density and pressure requirements of propane

5" mounting pattern and a hermetic shell designed for low vibration and reduced sound levels during operation

High Pressure Rated: Engineered to maintain seal integrity under standard refrigeration vacuum and pressure ranges

Carrier HH18HA499 Limit Switch dryseal taper pipe threads areThe Carrier HH18HA499 Limit Switch is a critical high temperature safety component engineered for Carrier, Bryant, and Payne gas furnaces. This automatic reset limit switch is designed to open the electrical circuit when internal plenum temperatures reach the 165F threshold and closes once temperatures normalize to 125F. It serves as a direct replacement for the HH18HA499A model, ensuring field compatibility and maintaining the original safety circuit