Stant 12701 Cooling System Pressure Tester Upgrade Kit for Stant 12255 Stant Engine Cooling System Pressure Tester Upgrade kit includes the components necessary to upgrade a Stant 12255 Coolant System Pressure Tester to the 30 PSI capacity of the newer Stant 12270 kit Includes the needed 30 PSI capacity head, hose, and gauge along with full instructions An economical alternative to replacing your entire old kit in order to upgrade to 30 PSI capacity Coolant System Pressure Tester Kit replaces the standard radiator cap with specially engineered testing components Pressure testing can help determine the health of cooling system components and radiator/recovery bottle caps by revealing pressure dependent leaks or components on the verge of failure