Features and Benefits:•This adapter can be used either along with the other T adapters already included in the HU35025 Universal Digital Pressure Tester, or alone to perform a pressure test of the cooling system. Its design reproduces the OEM connection allowing the technician to connect in various spots in the cooling system (help locate an issue by bypassing some elements). Examples: Connect to the line that goes to: EGR coolant port, radiator pressure release port, controlled thermostat port, or coolant reservoir port.Adaptor - Cooling System. USE WITH HU35025