This injector is for R12/R22 use only. It will not work on R134a applications unless #3045 Low Side Professional Snap Coupler is used. Directions: Before adding additive to injector, the shut off valve must be off. Unscrew the end of the injector. Put in the desired amount of additive in the injector. Screw the end back on the injector. Connect to the low side port (big line). Connect the top end o the injector to the manifold gauge hose (blue hose). Connect to rerigerant. Open the shut off valve. Fill to the proper pressure. When finished using the injector tool, clean well with brake cleaner. Note: A/C must be running with compressor turned on before injecting any additive or refrigerant.
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