Briggs Stratton B S Fuel Tank Gas Cap Compatibility: for 700 - 750 EX engines. Provides a# of critical functions such as preventing gas tank fumes from leaving the tank as well as protecting the fuel from outside contamination maintains the appropriate pressure in the fuel tank. Many fuel tanks are designed to use a vented fuel cap to prevent a vacuum from forming in the fuel line. If fuel is leaking from the cap, a properly fitted replacement cap can solve the problem. Features Power source type: Natural Gas, Features a tether so it won't get lost or misplaced Genuine Briggs Stratton replacement part for small gasoline engines This OEM part ensures proper fit and performance to maintain the life of your Briggs Stratton engine Briggs and Stratton genuine parts are specially designed to exact OEM standards Tether to keep it from getting lost or misplaced USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.