Using (someone else's) turkey cooker: where the fuel hose connects to
the cooker, it has a brass 'collar nut'. This has a tapered end, as if
it's supposed to seat and seal. There is a smaller tube that passes
through this nut, which also has a tapered end. There are no gaskets.
The only thing I see that can be tightened is the collar nut. However,
when this is tightened, the tube can still freely move in and out.
Mechanically, that makes sense to me - the collar is tightening against
its seat, rather than pressing the tube into any sort of seal. But, I
don't see how this arrangement seals anything: gas could easily leak
around the tip of the tubing, and then escape where the tubing passes
through the collar.
I checked the connection for leaks, and it seemed OK. So, we went ahead
and used it. But, I'm puzzled as to whether this is how it's supposed
to work. I think I'm just missing something?