Direct OEM Compatibility: Specifically designed for Marley and QMark heating equipment

For technicians performing maintenance or repairs

Constructed for durability in high-cycle environments

Durable Construction: Heavy-duty metal housing designed to resist thermal stress within the draft inducer assembly

a compatible dual-window cover from the T-4000 series must be used to ensure proper clearance and visibility

Honeywell 311852 Spring Direct OEM Compatibility: Specifically designedThe Honeywell 311852 spring is a critical component for maintaining precise pressure control in commercial HVACR pneumatic systems. Engineering grade and brown in color, this replacement spring is specifically designed for use with 8 inch MP953A and MP953C Series pneumatic actuators. It calibrated for a 2 7 PSI spring range, ensuring accurate proportional control of steam, hot water, or chilled water valves. This veteran technician approved part is