Robinair 16256 Oil Injector for 134a. 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 (measurements are marked on the barrel body). Connect the injector fitting to the low side access port on the vehicle and press the plunger to deliver the oil charge. Can also be used for fluorescent dyes. R-134a Oil Injector, 1/2" Acme quick coupler.
Robinair - SPX