Engineered as a high-performance OEM replacement part

The 'R' indicates a revised or updated version of the original 667210 part

always use the factory-specified 150 degree limit switch

Common Questions: How can I tell if my existing Mitsubishi control board is faulty

Rapid Response: Low-inertia housing allows for near-instant detection of temperature fluctuations

AERCO Boiler and Water Heater 27128-2 Pressure Switch Kit R-134A Engineered as a high-performance OEMThe AERCO 27128 2 gas pressure switch kit is designed for reliable monitoring and control of fuel gas pressure in AERCO boiler and water heater systems. This gas pressure switch kit ensures proper burner operation by verifying adequate gas supply before ignition, helping prevent unsafe firing conditions. Built for integration with AERCO combustion control systems, this boiler pressure switch is commonly used in commercial hydronic heating and domestic