SURR ACR80 Standard A/C Block Off Kit features push-to-connect unions designed for easy installation and long-lasting repairs . Features: · On the car repairs made simple · Make connections easily by hand with no need for specialty tool · Aluminum materials for improved corrosion resistance · Working pressure 450 PSI Burst Pressure 1800 PSI · Create secure seal with expandable locking collar · Can be used for high or low side repairs · Includes one each of 5/16”, 3/8”, 1/2”, 5/8” & 3/4” block offs