The Speedflow 932-06 3/8" NPT Internal Hex Plug is a precision sealing plug designed to close off 3/8" NPT female threaded ports in performance fluid systems. It provides reliable leak resistance and secure termination in fuel, oil, coolant and pneumatic plumbing where connectors are not required. Features 3/8" NPT internal hex thread Hex head for easy tightening Precision machined for secure sealing Suitable for fuel, oil, coolant and pneumatic systems Lightweight and corrosion-resistant construction Typical Applications Closing unused 3/8" NPT female ports Engine bay plumbing terminations Fuel and oil system block-offs Coolant and vacuum system closures General performance automotive plumbing Fitment Notes Fits standard 3/8" NPT female ports Use appropriate thread sealant or PTFE tape for leak-free installation Tighten to recommended torque for proper sealing