I need to tap a tongue muffler to screw in a nipple taken from an OS-762 muffler. I expect they're all the same. Does anyone know what the thread size on those pressure nipples is? Hopefully the LHS will sell a tap that size.

The Tongue muffler is so thin I could just force it, but I'd prefer to thread it.
Rusty

Yes, SAE. I can do the conversion for the diameter. Still don't know the thread pitch. I'll see if a 3mm muffler bolt screws into the hole..

Now that I'm actually in the same building as my mufflers I measured one -- M3x0.6.