3/8" NPT Threaded 304 Stainless Steel Bung Made in the U.S.A. from domestic material - very high quality. Specs: Threaded I.D. 3/8" NPT, O.D. .906", Length 1-3/16" Material: 304 Stainless Steel Speed Dealer is your #1 source for builder parts on the web. Used for making fluid holding vessels such as gas tanks and oil bags.