Review on 🔧 Mastercool 82375 R134A Oil Injector: Essential Silver Accessory for Seamless AC Maintenance by David Lambert

Following the directions I put 1 ounce of oil in my air conditioner with no problem. Forget the "pour oil in the hose" method I've already tried. You need that. I wiped the cylinder before use but to my surprise it was already clean. No metal chips or contamination. In my opinion it is a quality product.