Zeluga G845 O-Ring Kit for NV45AA, NV45AB, NV45AB2M Pneumatic Coil Roofing Nailer . Set of O-Rings designed to replace damaged or worn O-rings in roofing nail gun. It is used for proper seal that ensures efficient operation and prevents air leaks. Long lasting resistance and reliability to wear and tear. Withstands pressure, high temperatures and exposure to chemicals. Includes a comprehensive range of sizes to fit different sealing requirements.