Push connect air line fitting

Replace the O ring inside

 

They are less than $10. Get yourself a new one.

 

If they are brass quick connect fittings, they have o-rings inside.

If they are plastic quick connect, they are disposable.

 

I have a very bad taste for those. The first ones I know of were on CL9000's. Ford must have had a major accident claim. A guy in the shop was put on one to replace every fitting throughout the truck.
Three weeks latter he was finished. Thanks you did a great job! Will you get the other 9000 parked in the back and do it the same way?
After almost accepting them as improved version and good to use I went on a service call today. Plastic piece of junk broke in half and lost all the air pressure.
I have to live with them in places but will always use DOT compression fittings when possible.

 

If you got enough air line you can trim the end of it a little bit and then reconnect it.
Sometimes that helps, if not new fitting.

 

never seen a brass airline connector with o rings.