The Yellow Jacket 0-500PSI R-22 R-134a R-404A 686800 Refrigeration Gauge 49015 is a high-quality red pressure gauge manufactured by Ritchie Engineering in the United States. Designed for professional use in the heating and cooling industry, this manifold gauge is accurate and reliable for installation and testing purposes. With a model number of 49015, this Yellow Jacket gauge is a valued tool for ensuring proper refrigerant levels and pressures in heating and cooling systems.