This is a replacement 2" coarse thread bung cap with a 3/4" Female NPT cut-out center threaded tap for a faucet, spigot, hose, or pipe fitting. Will fit all UN standard 55, 30, & 15gal barrels. Most 55 and 30 Gallon UN Poly Barrels sold in the US have one (1) course thread and one(1) fine thread 2" cap. We also sell fine thread caps. High quality injection-molded high-density polyethylene plugs with precision threads for leak-tight fit. 2" Gasketed Bung for replacing old or damaged caps on Bulk Water Drums. Coarse thread fits 63mm American Buttress thread plugs. Includes a gasket. Includes a 3/4" NPT Knockout for hoses or spigots.