High-Temp Performance: Designed to maintain a secure seal under fluctuating steam pressures and high-temperature conditions

offering superior dielectric strength compared to lower-rated alternatives

the "U" designation typically refers to retail or universal packaging

the 661057R is specifically sized (#57) for Liquid Propane (LP) applications

Nordyne 626422R Limit Switch High-Temp Performance: Designed to maintainThe Nordyne 626422R Limit Switch is a critical safety component designed for furnace rollout protection in gas fired and oil fired HVAC systems. This thermal limit switch is engineered to open the circuit at a 155F cut out temperature, immediately interrupting the gas valve circuit if flame rollout or excessive heat is detected near the burner box. As a manual reset rollout switch, it requires a technician to physically inspect the heat exchanger and