I recently repaired the air conditioning on my wife's Subaru and when filling the system I forgot to add PAG oil first and there were no cans of coolant with PAG oil already in it. I didn't want to pay someone to take the R134A out of the system and start over, so I ordered it and waited a few days for the job to be done. This tool allowed me to inject PAG oil and dye into a partially charged conditioner, which was exactly what I needed. Great tool! Five stars all the way!
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