Everflow BRSP0014-NL 1/4-Inch Male National Pipe Taper Threads Brass Solid Plug with Square Head, Lead Free Brass Pipe Fitting, Higher Corrosion Resistance Economical & Easy to Install Square Head Solid Plug for 125 lb. applications for Closing and Terminating the End of a Pipe Brass Body Constructed; Male National Pipe Taper (NPT) threads for use with female threaded pipes Manufactured to Standard ASTM B-584-06 for Lead-Free Quality Assurance Relative Softness of Metal Enables Tighter Seals and Greater Ease in Installation Made from Lead-Free Brass for Higher Corrosion Resistance Than Steel; It's certified to Meet NSF/ANSI 61-G Standard for Quality Assurance Lead-Free Brass Is Comparable In Strength To Stainless Steel And Is More Corrosion Resistant. Brass Body Construced Manufactured to standard ASTM B-584-06 for lead-free quality assurance