Where exactly does the O-ring fit when installing the recirculation fitting on a 10 gal mash tun?

The red O-rings should have arrived slipped over the threads that will ultimately be on the inside of the mash tun.

If you notice carefully, there is an O-ring groove between the lock nut and the bulkhead's main body.  So essentially the o-ring stays exactly where it is now, just remove the extra and set it aside for safe keeping, then you're ready to install the bulkhead.  

In turn, the o-ring will actually make its seal on the outer surface of the inner mash tun wall.

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