Is the Allanson 2721-668 compatible with older 2721-668SF models

Field technicians rely on the HK02ZB309 for its 120/240V compatibility and its robust braze mount design

Is this compatible with all Raypak heaters

If you are seeing erratic shutdowns or short-cycling

eliminating the guesswork of universal fitment issues

Lennox 97L01 Limit Switch THPU32HP7Y Is the Allanson 2721-668 compatibleThe Lennox 97L01 Limit Switch is a critical OEM replacement part engineered for precise thermal regulation in Lennox gas furnaces and air handlers. This L200 30F limit switch is designed to open the electrical circuit if the heat exchanger temperature exceeds its 200F setpoint, preventing mechanical failure and ensuring safe combustion cycles. With a 30F differential for automatic reset, it provides consistent high limit protection and prevents