Mastercool Inc., Manufacturer of Air Conditioning, Refrigeration, Service Tools and Equipment

Product Description

Test with Confidence. Refill with Speed. Built for Heavy-Duty Performance.

Take the hassle out of heavy-duty cooling system service. The Mastercool 43306 Heavy Duty Cooling System Pressure Test & Refill Kit is designed for professional technicians servicing large trucks from Freightliner, International, Kenworth, Peterbilt, Mack, Volvo, GMC, and Sterling. Powered by regulated shop air, the system maintains consistent pressure during testing while four quick-disconnect vacuum attachments enable fast, airlock-free coolant refilling. By eliminating unreliable rubber plugs and bladders, the kit helps reduce setup time, improve diagnostic accuracy, and deliver more dependable service results.

SHOP-AIR POWERED PRESSURE TESTING – Uses regulated shop air at the recommended 90–125 psi to maintain constant pressure during service—eliminating the need for bulky hand pumps.
FAST VACUUM REFILL – Four quick-disconnect vacuum attachments allow rapid coolant refilling while helping eliminate airlocks for smoother, more efficient service.
NO RUBBER PLUGS OR BLADDERS – Engineered to eliminate unreliable rubber plug-style components, reducing setup complications and helping technicians achieve more precise test results.
BUILT FOR HEAVY-DUTY TRUCKS – Designed for cooling systems on Freightliner, International, Kenworth, Peterbilt, Mack, Volvo, GMC, and Sterling vehicles.
HEAVY-DUTY ADAPTER SET – Includes color-coded adapters for quick identification: #2 White, #12 Black, #13 Red, #14 Green, and #15 Yellow.
COMPLETE SERVICE KIT – Includes pressure regulator, refill hose, spindle A, refill adapter, vacuum refill attachment, tubing, and heavy-duty vehicle adapters.
ORGANIZED & PROTECTED STORAGE – Durable blow-molded case keeps adapters and components protected, organized, and ready when you need them.