The SVTS263 Snap-On Air Powered Cooling System Pressure Tester is a high-quality diagnostic tool designed specifically for automotive use. This unit, manufactured by Snap-On, accurately tests the cooling system for leaks by maintaining a constant pressure or you can turn off the air supply and monitor for pressure drops. This product is reliable and built to last, making it a valuable addition to any automotive tool collection. This unit is in great used condition and has had very little use. Please see pictures! Free Shipping!