New Belt tensioner for military Humvees. 

HM-1024 | Serpentine Belt 98" inch A2 Series HMMWV

• Primary Function: It uses an internal spring mechanism to keep continuous, automatic pressure on the serpentine drive belt. This keeps the belt from slipping off or squealing while spinning vital engine accessories like the alternator, water pump, and power steering pump.
• Common Part Numbers: 12469484, 600637, and NSN 2920-01-491-2011.
• Compatibility: Made for AM General Humvee A2 models with the 6.5L engine (Serial Number 196901 and abov