Pump Motor Compatible with Brand Armstrong Compatible with Manufacturer Model Number 1050-1.25b 1050-1.5b 1050-1b 1050-2b H-52 Compatible with Pump Type In-Line Circulating Pumps Compatible with Series S H 5 Series Compatible with Series Family 1050-1.25b 1050-1.5b 1050-1b 1050-2b H-52 Horsepower 1/3 Maximum Ambient Temperature 104 Degrees F Maximum RPM 1 800 RPM Minimum Ambient Temperature 32 Degrees F Motor Enclosure Design Open Drip-Proof Motor Thermal Protection Auto