1” NPT Female Weld Bung – Steel Product Details Made from Weldable Steel – Thick durable construction Precision CNC Machined – Delivers a polished finish and leak-free performance with tight tolerance 1” NPT Female Thread – Tapered thread Stepped Double-Sided Design – Installs in a 1-5/16" hole Ideal for Custom Projects – Use in tanks, housings, manifolds, thermometers, coolant tanks, heat exchangers where a flush, threaded weld-in solution is needed Why use step bungs? Cleaner alignment and better weld strength