Get your hands on a genuine Roosamaster/Stanadyne 13839 delivery valve spring for your diesel fuel injection system. Made of durable metal, this direct fit part is designed to ensure optimal performance and compatibility with your vehicle. Manufactured in the United States, this high-quality product is a perfect replacement for your worn-out or damaged valve spring, providing you with reliability and peace of mind on the road. Upgrade your fuel delivery system with this OE/OEM part to keep your engine running smoothly.