Review on Injector Refrigerant Coupler Charger NAKAO by Rubeen Black

When I first opened it to put oil in, I noticed metal shavings in the cylinder. I suspect it wasn't properly cleaned or deburred during manufacture. This is literally the last thing you want to cram into your AC system. I contacted the seller to try and fix it and they suggested I clean it. It's not clear how the rest is disassembled and the seller couldn't tell me how to disassemble it completely so I didn't use it.