Matco's Cooling System Tester, No. RPT102, includes a gauge with internal shock absorber and external rubber boot. The cap features a rotating lever for fine pressure adjustment and safe pressure release. Includes three cooling system adapters, MPT10128, MPT10138, MPT10036P. Adapters are shaped similarly to the caps from system being tested, making selection of correct adapter easier. Tester includes a cooling system adapter selection guidebook.