The Mazzei barbed cap replacement is designed for compatible #484 and #684 injector applications where the cap component needs replacement. A barbed cap is useful because it helps close and secure the related connection point, supporting dependable injector assembly and more consistent system performance.This replacement is especially useful when the original cap is cracked, leaking, damaged, or missing. Using the correct replacement helps preserve intended fit and dependable ozone-system operation.The CAP K .25 is a practical service part when a compatible Mazzei injector needs a barbed cap to restore dependable connection support. Mazzei barbed cap replacement Fits compatible #484 and #684 injector applications Helps restore secure connection closure Useful when the original cap is damaged or missing Supports cleaner and more dependable ozone-system performance