FUEL LIFE In Tank Fuel Stabilizing Filters 3 Packs of 2 (two) (6 filters total) Stabilizes gasoline up to 2 years Prevents water from separating in the fuel (phase separation) All 2 4 cycle engines Non-chemical, non-liquid fuel stabilizer Environmentally and eco-friendly Fuel Life is the simplest, NO-CHEMICAL option to keep fuel fresh and stabilized to prevent these problems. Simply drop in the fuel tank for up to 2 years of protection. No chemicals, no measuring, and no mess; just leave in the tank during operation (or remove by the high strength tether at any time). Use Fuel Life to save time and money by avoiding equipment repairs.