Pump Motor Compatible with Brand Armstrong Compatible with Manufacturer Model Number 1050-1.25b 1050-1.5b 1050-1b 1050-2b 1060-1.5d 1060-2d H-53 H63 S55 Compatible with Pump Type In-Line Circulating Pumps Compatible with Series S H 5-6 Series Compatible with Series Family 1050-1.25b 1050-1.5b 1050-1b 1050-2b 1060-1.5d 1060-2d H-53 H63 S55 Horsepower 1/2 Maximum Ambient Temperature 104 Degrees F Maximum RPM 2 000 RPM Minimum Ambient Temperature 32 Degrees F