This 1-inch Watts 40XL-4-150 unit features a 4-inch extension thermostat with a specialized thermo-bonded coating to minimize mineral buildup and ensure consistent thermal response in rigorous environments

Technicians typically observe high discharge pressure

the 8620-080 serves as a direct OEM replacement fan switch

Precise Thermostatic Control: High-accuracy temperature sensing to minimize hunting and overshoot in commercial HVAC systems

Key Benefits Corrosion Resistance: All-stainless steel construction with a hardened disc and seating surface resists chemical attack and wire-drawing

Aprilaire 4410 Sensor Assembly 326070-701 This 1-inch Watts 40XL-4-150 unitThe Aprilaire 4410 Sensor Assembly is a critical genuine OEM replacement part designed specifically for the Aprilaire Model 400, 400A, and 400M humidifier series. This Water Level Sensor Assembly operates using two high precision magnetic reed switches wired in series to monitor the positioning of internal floats. When the water level in the sump drops, the floats descend, closing the switches and triggering the water solenoid valve to replenish the