Briggs & Stratton 497929S Fuel Tank Cap For 3.5 and 3.75 HP Classic and Sprint Engines and 4 HP Quattro 450-600 Series Engines, Model: 497929S, Home & Garden Store Briggs & Stratton 497929S For 3.5 and 3.75 HP Classic and Sprint Engines Also for 4 HP Quattro 450-600 Series