This fuel feed priming pump is specifically designed for NRR, NQR, and NPR-HD trucks equipped with the 4HE1 4.8L engine from 1998-2004. The durable aluminum construction and precision engineering ensure reliable fuel system priming when needed. Features include a threaded fitting for secure installation, copper washer seal for leak prevention, and an ergonomic grip cap for easy manual operation. This replacement pump helps maintain proper fuel system function by allowing air removal and system pressurization during maintenance or after running dry. Direct fit compatibility means straightforward installation without modifications. Keep your diesel engine running smoothly with this essential service component that matches OE specifications for fit and function.