Merkle-Korff 1 RPM Counter Clockwise Auger Motor with a 3/8" Shaft Diameter. Fits many pellet stove models including the following: 

Quadrafire: 800, 1000

Compatible with Quadra-Fire part # 812-0170 

Englander: 25-PDV, 25-PDVC, 25-PI, 25-PAF, 25-PDVP, 55-SHP10, 55-SHP10L, 55-SHP20, 55-TRP10, 55-SHP22, 55-SHP22L, 55-TRP15, 55-TRP22, SHP25, 55-TRP25, American Heritage, American Standard, US 25-5670

Compatible with Englander part # PU-047040 

US Stove: 5520 (Auger), 6033 (Agitator), 6037 (Agitator), 6039 (Agitator), 6041 (Auger), 6100/6220 (Auger & Agitator), 6500 (Agitator), 8500 (Agitator)

Compatible with US Stove part # 891141

King: 5500M (Auger), 5502M (Auger), 5500XLT (Auger), 5510 (Auger)

Compatible with King part # 891141

Vogelzang: VG5770 (Auger), VG5790 (Auger)

Compatible with Voglezang part # 892187

Breckwell: Big E II -SP1002, Heartland SP6000 - 2012 and newer (Auger), SP8500 Multi-fuel

Compatible with Breckwell part # 891141

Ashley: AP5710

Compatible US Stove part # 80488 & 80457