The Mastercool 43306 Heavy-Duty Cooling System Pressure Test and Refill Kit uses shop air to maintain constant pressure during diagnostics, providing accurate detection of leaks, cracked blocks, and blown gaskets. The kit includes quick-disconnect vacuum attachments and a refill adapter that allows fast coolant refilling without introducing airlocks. Multiple heavy-duty vehicle adapters fit most commercial trucks, including Freightliner, International, Kenworth, Peterbilt, Mack, Volvo, GMC, and Sterling. All components, including the pressure regulator, store neatly in a durable hard case for easy transport.
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