Spectra Premium Spectra Fuel Tank TO13A Unit is designed to Original Equipment (OE) fit, form and function requirements Lock ring included to reduce installation time and to ensure a complete repair Made with corrosion resistant, OE approved, Ni-Terne steel for durability Unit is leak tested after production to ensure product is free from fuel and/or evaporative leaks Road tested to ensure real world performance and to verify that each design meets Spectra Premium's high standards for quality