Sorry this took so long--I had to remove the nose of my 450 to get at it. The "plug" is an odd size--slightly smaller than a 2 inch pipe plug, but it is definitely a tapered, pipe, thread. I asked a man with a lot of hardware experience about it, he said it is the same size and thread used on the larger bung of a steel 55 gallon drum (a "barrel plug"). I actually have one around my place, if I can put my hands on it; if you send me your address, I'll mail it to you. Let me know. Hugh
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