Just got my first camper at the weekend and the chap i got it off said the fridge didn't work off the gas as a pipe had corroded and never got replaced. This is what i found when i pulled the fridge out...

I've done a bit of research and found the square thing is the pilot shield and have found where it needs to be relocated so that;s not a prob but can anyone identify the pipe? Exhaust pipe? Seem like it's been cut off from somewhere at one end?

I assume this is where 1 end of said missing pipe will connect as gas comes out when it's turned on. I'm also assuming the other end goes down the back of the fridge to the bottom and connects here:

Is this where the exhaust would fit?

What's the metal dip stick type thing inside do?

Thanks for any info. Is this something it's safe for an untrained person (me!) to be findling with or is it best to take it to a expert? I've disconnected the electrics to the fridge for the time being to be on the safe side.
Cheers,
Jason