1 Air Valve extender shift knob top is 1/2 x 13 common thread 

****MUST BE OLD VINTAGE PIN STYLE OF SEMI TRUCK AIR VALVE ****

Add shift knobs to your PIN air valve. fits 3/8 inch inner diameter 



ADD SHIFT KNOBS TO YOUR AIR VALVES

• Aluminum W/ Chrome plating 
• Comes with Roll PIN
• When installing use gloves as threads can be a bit sharp. 
  
  
  Tips
  
  
  
• To remove your old pin you can use a punch or a small star tool with hammer 
  
  
  
• To install easier you can use a Channellock pliers just make sure to protect the chrome plating on other side with a cloth or mat from pliers teeth 
  
  
• Intsall tapered end of roll pin into hole first

• You can also use a vice to squeeze roll pin a bit  more to help it go in better before install.
  
  
  * Shift knob not included just to show how adapter works. We have many shift knobs in our other items you can use. .
  * We also have the screw on type air valve adapters for shift knobs as well if you check our other items