(one 2 inch & one 3/4 inch) together in a set, The 2" plugs are Zinc Plated Buna Gasket Mod. 2TPB 3TPB The 3/4" plugs are Rieke 3/4" Titegrip Steel Bung Nut Cap Plug w Buna Seal 55 Gallon Drum Barrel T-200 Brand new coated steel 3/4" and 2" cap with Buna Seals Tite-Seal Closures. Since 1983, we have been the exclusive supplier of Tite-Seal plugs and Tite-Seal flanges. Tite-Seal flanges (octagonal) and round plugs meet all U.S. DOT and U.N. standards and are completely interchangeable with other similar brands of drum closures. Standard Tite-Seal closures are electroplated with bright zinc and yellow passivated against corrosion.