Fuel Cap / Briggs & Stratton 397974SPack Size:1Briggs & Stratton 397974, Briggs & Stratton 493017, Briggs & Stratton 4131, Briggs & Stratton 397974S, Briggs & Stratton 692046, Briggs & Stratton 4227, Briggs & Stratton 5044H, Briggs & Stratton 5044K, Craftsman 33385, John Deere PT11028, John Deere M143291, John Deere LG397974, John Deere PT12572, Partner PR1099015Edgewater 380715, ESF 139-005, Foley/Belsaw 5978326, Foley/PLP 139-005, Green Meadow GC107, Home Depot 940976, J. Thomas GC-594, Kwik-Fix 839005, Laser L3182, Laser 97534, Lowe's 305, NHC 264-6120, Outdoor Factory Parts 578416402, Oregon 07-304, Prime Line 7-04922, Rotary 6593, Sunbelt BR-74, Sunbelt B1BR74Briggs & Stratton For 3.5 thru 6 HP vertical Max, Quantum and Europa enginesID: 1 3/4 ", Not compatible with greater than 10% ethanol fuel