"AIR POWERED PRESSURE PUMP. This pressure tester features an air-powered pump and comes with four adapters specifically designed for use with heavy-duty trucks","QUICK PRESSURE GENERATION. Effortlessly generate pressure using compressed air, allowing for swift testing of the cooling system without the need for manual pumping","SAFETY BLOWOFF SPRING. The APC104T is equipped with a safety blowoff spring that prevents over-pressurization","FOUR COMMON ADAPTERS INCLUDED. The set includes the four most commonly used adapters for heavy-duty trucks (A4505B, MPT0010, MPT10096P, and TA50) TRUCK AIR POWER COOLING SYSTEM PRESSURE TESTER APC104T | Matco Tools