Exhaust Valve / Briggs & Stratton 390420Pack Size:1Briggs & Stratton 390420, Briggs & Stratton 691794ESF 188-064, Foley/Belsaw 5979841, Foley/PLP 188-064, Laser L5580, Laser 94195, Oregon 36-516, Prime Line 7-03021, Rotary 8049, Sunbelt SB-8049Briggs & Stratton 195700, 196400, 196700 and 402400-422700Head Diameter: 1.250 ", Length Diameter: 4.406, Stem Diameter: 0.309", Type: Exhaust, Face Angle Diameter: 45 Degrees, Ethanol: Not compatible with greater than 10% ethanol fuel