Engine Long Block Short Block. New Fuel injector Cummins Top Stop Injector N855 NT855 NTC 3047973 3030445. Price For 1 Pcs. The specifications for Cummins injectors of the same model can vary significantly and are not interchangeable. Using the wrong injector may cause engine issues such as excessive smoke and power loss. We strongly recommend that buyers verify the part number before purchasing. If you are unsure of the part number, please provide us with the engine serial number or CPL number, and we will assist you in finding the correct injector. Warning : Cummins parts can be quite complex, and even the same engine model may use different parts. For this reason, we strongly recommend that customers order parts based on the specific part number. If you are unsure of the part number, please provide your engine number or VIN, and we would be happy to assist you in verifying the correct part. The count starts from the day after you placed your order and excludes weekends and holidays. We are subject to labor law regulations that restrict weekend sales services. All the warrantee Are Limited in Parts Only, engine rotation is very Danger, to be safe when the engine running all the people must keep distance at least 10 feet away from engine rotation radius, any time the shut down valve must be active, keep your engine can be stop any time.