3/8 NPT Weld Bung - Steel

The ARP 3/8 NPT Weld Bung - Steel is a precision-engineered port adapter designed for custom engine builders, fabricators, and performance mechanics integrating auxiliary systems into fuel rails, manifolds, intake runners, or fluid distribution blocks. This bung serves as a sealed connection point for various applications, including fuel pressure gauges and nitrous oxide distribution lines, making it essential for serious engine modifications.

Manufactured from solid steel, this ARP component features a 3/8 inch NPT (National Pipe Thread) female port for reliable, industry-standard connections. The weld bung design incorporates a flanged body that seats flush against flat or curved surfaces, with a generous bore diameter optimized for full flow in fuel rail applications. ARP's cold-forming and precision threading ensure minimal material stress concentration and repeatable seal quality across multiple weld-and-install cycles.

Whether you're building a turbocharged street engine or preparing a competition vehicle, the weld bung provides a leak-free, professional mounting solution that handles both atmospheric and pressurized applications. It is compatible with various systems, including temperature sensors and methanol injection, making it a versatile choice for any performance setup.