I managed to over torque my drain plug after pumping fresh grease in my upper zerk. I noticed that the plug had a hollow shaft as pictured. Is there a reason that this is designed this way or could I get away with just replacing it with a same sized bolt?
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Is that the new lower unit? My guess is that it is a pipe thread and not a regular bolt. It looks like a brass pipe plug. I would replace with the same in case it ever gets broke off it will be easier to remove.

It's going to have different threads than a bolt. Go to a hardware store or big box home improvement store and match it up.

Damn u lucky it broke and not cracked the cast LU. That's probably an NPT thread like others have said.

Yeah, it's on the new lower unit. I found a matching size/threaded stainless bolt at lowes that will work. I just wasn't sure about it having a hollow shaft. I'm gonna call gator tail in the am and ask them. It just drives me crazy when stuff like this happens over the weekend.

Even if the threads "match" the plug you broke is tapered. A bolt will never tighten up in that hole till it bottoms out. A pipe plug is tapered so it gets tighter the farther you thread it in.

-get a correctly sized pipe plug for it and don't ovrrtighten it. It doesn't have to be retarded gorilla tight.

Yeah, that's what I got. Just like this one.
plug.jpg

10-4, put any Teflon on it? Don't know if GT recommends it but I can't see it being a bad thing...