Manufacturer Name: Carrier Product Number: HK02ZA442 OEM Part Number: HK02ZA442 The Carrier HK02ZA442 (a lightweight component at around 0.19 lbs) is a vital safety switch named a high-pressure switch, designed for Carrier HVAC systems (verification needed for compatibility with other brands). This small but significant switch plays a critical role in protecting your system from ... https://www.partshnc.com/pressure-switch-448op327cls-2