Stant Radiator Cap/Cooling System Tester Adapter is durable, accurate, and easy to use. It allows you to test today's cars higher pressure cooling systems and pressure caps up to 30 pounds. It ensures usability on virtually any vehicle. It is designed to test cooling systems and radiator caps. Stant Radiator Cap/Cooling System Tester Adapter has quality craftsmanship and durability. It fits perfectly and meets/exceeds OE specifications it replaces.