Mike-This hurts, but I am going to have to admit I am wrong. The plug is not
a tapered pipe thread. It is 3/4"X16 TPI, in other words a 3/4" SAE bolt. I
was curious enough to take my plug out and measure it. You could use either
a hex bolt(about 3/4"length) with a sealing washer or an allen set screw with
sealer. Also, I tried to remove on old aluminum plug with an ez out without
success, the aluminum is too soft. It would probably have to
drilled&retapped. Anyway, an auto parts or hardware store should have the
plug. Anybody have a tool to remove a foot from a mouth? Berry
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