GB premium remanufactured injectors are completely torn down, ultrasonically cleaned, inspected and remanufactured using premium components. Each injector is tested on a sophisticated flow bench under multiple operating parameters. This GB four-pack kit includes four cylinder-specific high-pressure fuel lines that should be replaced any time the injector is replaced. Replacing all four injectors at the same time with the fuel lines ensures a complete repair and reduces the chance premature injector failure due to contamination from the fuel line. This injector four-pack offers savings over purchasing single injectors and components separately.