Features & Benefits: FJC Heavy Duty Cooling System test and refill kit uses shop air to maintain constant pressure to the cooling system during testing and refill.; 4 Quick-disconnect vacuum attachment allows rapid refilling of the cooling system, and eliminates airlocks; Our kit is designed for use with Freightliner, International, Kenworth, Peterbilt, Mack, Volvo, GMC and Sterling cooling systems.; Our Kit includes heavy duty vehicle adapters, a pressure test regulator, a vacuum refill attachment with tubing, all in a durable storage case; Our FJC Heavy Duty Cooling System Test and Refill Kit, Part# 43655 is proudly made in USA;