Roadside Fix-A-Flat S430 Tire Inflator/Sealant, 20 oz, White, Foamy, Milky Liquid | Fix-A-Flat aerosol tire inflators are the easiest and quickest way to repair a flat tire in an emergency. Fix-A-Flat is designed to seal small tire punctures in seconds and provide enough inflation to lift the rim off the ground. Our new water-based, better-performing sealant formulation is 100% environmentally friendly, with zero global warming potential propellant.