The Uniweld USI4EZ Solution Injector has a capacity of 4 oz. and is used to inject solutions into an air conditioning and refrigeration system. The USI4EZ was designed with durability in mind; it is constructed of rugged aluminum and has a maximum working pressure of 600 psi. The USI4EZ Solution Injector has a ¼" Male Flare fitting with a valve core at one end and a hand valve with a short length of hose and an EZ-Turn Anti-Blowback fitting at the other end. This solution injector can be used to introduce any solution to an AC or refrigeration system. The procedure for using Uniweld's USI4EZ Solution Injector is easy to follow and the instructions for use are printed right on the label for easy reference. Uniweld's USI4EZ is a versatile tool that will make your job easier. Go pick one up today at your local HVACR distributor. Uniweld, Quality Tools That Go To Work With You.