Doesn't fit my 55 gallon blue plastic drums. Everything looks right, but they don't screw all the way in. It feels like it's caught on the thread, like it's moved away a bit. The original plugs I have are screwed in all the way from weathering. I was hoping to get a replacement just to make sure it was waterproof but I was disappointed. Like the other reviewer here, I also punched one of the 3/4 holes so I can't go back, it's up to me. Just make sure they fit first.