What is this?

It’s on the inside, passenger side firewall. I also believe that it chatters like crazy when it’s below zero outside.

That is to be used in extream emergencys. That is the cab boost line and the line to the intake manifold is not hook up. In extream emergencys like you need to double your speed or your passenger has diarrhea they can open it up and it gives you 110 lbs of boost. It is a one time use only though sorry.

Floridianson said:

That is to be used in extream emergencys. That is the cab boost line and the line to the intake manifold is not hook up. In extream emergencys like you need to double your speed or your passenger has diarrhea they can open it up and it gives you 110 lbs of boost. It is a one time use only though sorry.

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That was funny !

So nobody knows what that is?

ThinkBig said:

So nobody knows what that is?

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I can't remember but someone said what that air line was put there for. Myself I put a chuck there for an air hose.

ThinkBig said:

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It’s on the inside, passenger side firewall. I also believe that it chatters like crazy when it’s below zero outside.

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Auxiliary air connection point. There is a valve to open or close the end of this air line. there should also be a brass screw-on cap for the end of this line connected by a short chain so it does not get lost. the cap could be loose and the valve partly open leading to the chattering you mentioned. your picture is not clear enough to tell what is on the end of this line. perhaps someone has installed a screw on quick connector for an air line and it is leaking. you might be able to find information about it in the operators manual. available on this website if you don't have one.

That is a fitting for an air line to inflate tires. Later trucks didn’t have them since they started getting air lines with a glad hand. The early BII had an air line with a fitting. The trucks we had when I was active duty were mostly made in ’62 and ’63 and had that fitting.

Scrounger said:

That is a fitting for an air line to inflate tires. Later trucks didn’t have them since they started getting air lines with a glad hand. The early BII had an air line with a fitting. The trucks we had when I was active duty were mostly made in ’62 and ’63 and had that fitting.

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Yup, My truck came with the quick connect fitting and a 20' aeroquip hose with tire filler. It worked great.

my 53 reo has the airline under the dash with a capped valve on driver and pass sides. planning on using it to run my air horns as its handy and already has a valve to isolate the modifications to the air system if needed

Scrounger said:

That is a fitting for an air line to inflate tires. Later trucks didn’t have them since they started getting air lines with a glad hand. The early BII had an air line with a fitting. The trucks we had when I was active duty were mostly made in ’62 and ’63 and had that fitting.

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That makes perfect sense. Mine is a 69’ and has glad hands. Maybe they put them on longer than thought.

Pretty sure it's descibed in the -10TM.

My '71 has it, it is handy.

My 1988 still had them also. I removed it and added my own fittings on the front and rear bumpers.