• 4 quick disconnect vacuum attachments provide quick refilling of the cooling system and eradicate airlocks
• For use with Freightliner, International, Kenworth, Peterbilt, Mack, Volvo, GMC and Sterling cooling systems
• Uses shop air to uphold continual pressure to the cooling system during testing and refill
• Includes heavy-duty vehicle adapters, pressure test regulator, vacuum refill attachment with tubing in a plastic case

The Mastercool 43306 remove the complications that often result from unreliable rubber plugs or bladders with our heavy duty cooling system pressure test & refill kit. This kit will save set-up time and provide precise test results.