The Snap-on Automotive Cooling System Pressure Tester Set, No. SVT275, includes an inflatable bladder sealing system for use with most passenger and light commercial vehicles. Tests header tanks and radiator systems as well as thread-type and bayonet-style caps. Locate leaks from head gaskets, radiator and heater cores, Welch plugs and housings, water pumps and hoses. Test cap relief pressure and seal condition. The fluid drain tube allows coolant to be returned to reservoir or safely collected for recycling. Bladders are cycle tested to over 1,500 inflations. This set includes SVT2751 through SVT27514 (14-pc set), plus air supply hose, drain hose and instruction manual in storage case.