Nu-Calgon - The A/C Re-New Injector was designed to inject A/C Re-New into air conditioning and refrigeration systems. It has a capacity of 4 fl. oz. and can be used for other injectable products as well, including amounts less than the 4 fl. oz. capacity. It is constructed of rugged aluminum and has a maximum working pressure of 600 psi. It has a Schrader fitting at one end and a short length of hose with a ball valve on the other end.