The Hickok/Waekon Heavy Duty Cooling System Test Kit, No. 62968, eliminates potential leak issues with rubber plugs or bladders, reduces set up time and quickly pressurizes and maintains system pressure so techs can find the leak the first time. The one-piece, all aluminium adapters last a lifetime, and the quick disconnect hook-up design minimizes set up time. The tool uses shop air to maintain constant system pressure for efficient leak detection. It is compatible with Freightliner, International, Volvo, GMC, Kenworth, Peterbilt, Mack and Sterling. The kit contains five heavy duty truck adapters, an "A" spindle adapter, a pressure test regulator, a 5' pressure release hose and a blow molded storage case.