Use these syringe-type injectors to add oil to a fully pressurized A/C system. Just fill the barrel with the amount of oil needed, connect the injector and press the plunger.
 
 
 
16256 - R134a Oil Injector, 1/2" Acme quick coupler
     
     
 
16258 - Oil Injector, 1/4" SAE Fitting
     
     
    * Not Recommended for UV dye injection