SURR ACR90M Metric 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 8, 9, 10, 12, 14.5, 14.5-16, 15, 16 & 19mm block offs