Review on 🧃 FJC 2734 R134A Refrigerant Oil Injector by Robert Hole

This is a great injector once (as others have said) it can be opened. It's locked so tightly that you'll need a large vise or channel locks the first time you open it. It comes with instructions that you can pretty much ignore. You're expected to connect it to the bottom (blue) line of your manifold, which uses 1/4" FFL fittings, but the injector itself has 1/2" ACME fittings and a yellow hose, which allows it is clear that it is designed to match the yellow pressure gauge lines. Fits perfectly between the Harbor Freight Distributor's yellow line and the faucet.