Looking for a reliable and high-quality replacement for your 5.9 Cummins 2003-2007 fuel rail pressure relief valve? Look no further than the Cummins 3947799! This direct-fit replacement valve is constructed from high-quality materials and is designed to maintain factory fit and performance. Plus, it's backed by Cummins' reputation for quality and reliability, so you can rest assured that it will stand up to even the most demanding applications. Don't trust your engine to just any replacement part - trust the experts at Cummins and get your 3947799 today!