Contains one Fresh Start Fuel Preserver Cartridge (699998). Gas Caps are sold separately. The new Briggs & Stratton Fresh Start Cap & Cartridge Fuel Preserver system automatically drips concentrated fuel preserver into your tank to keep your engine running at peak performance. This new product will help keep your fuel fresh for up to six months! Advantages of Fresh Start: Convenient to use Keeps gas fresh Ensures easy starting Keeps the carburetor clean Briggs & Stratton Genuine Part Designed specifically for our engines and can save on costly repairs while maintaining valuable warranty coverage.