Universal 30 pound cooling system and pressure cap tester is the quick, accurate way to tell instantly if a cooling system or radiator cap is defective. Use it anywhere a standard radiator cap fits. No guesswork, you see exactly where repair or replacement is needed. The tester comes with a 14� flexible hose, an easy to read color coded 2� diameter dial with ranges of 17-19 lbs., 20 lbs. and 28-30 lbs. spacers/adapters for 1� and 3/4� deep filler necks and instruction manual. All in a sturdy plastic carrying case.