Fasco D1061 Motor 320788 703 The Watts 0274426 (Series 174A) The Watts 0274426 (Series 174A) is a heavy duty 3 4" bronze boiler pressure relief valve engineered specifically for high capacity protection in hot water heating systems and domestic supply boilers Optimized Airflow: The 3 blade configuration is balanced to reduce mechanical stress on the condenser motor bearings 4 inch diameter and base stud mounting options simplify retrofitting in existing attic exhaust and air move equipment The Fasco D1061 Motor is a high performance shaded pole replacement motor engineered for specific Greenheck OEM applications and general purpose ventilation