The Mastercool 27-pc Master Radiator Pressure Test Kit, No. 43301, is designed to detect and expose external system leaks, and detect internal engine leaks due to blown gaskets or a cracked block. This kit features a vacuum cooling system, purge and refill for quick change of coolant and a test range of 0 to 35 psi. The kit includes a blue radiator test connector (R123/R125), a black radiator test connector (R123/R124), a thermometer, universal radiator cap, purge and refill tool and additional installation accessories. The kit includes a hand pump and 19 adapters that will fit most popular domestic and import cars and trucks, according to the company.