The Yellow Jacket Class 1 R-22 R-134a R-404A 350PSI Pressure Gauge 415658 is a high-quality tool used in the HVAC and refrigeration industry. This pressure gauge is designed for use with various refrigerants including R-134a, R-410A, R-404A, and R-22. With a single valve and a blue color design, this gauge is easy to read and provides accurate measurements for troubleshooting and maintenance purposes. The Yellow Jacket brand ensures reliability and durability in this essential tool for professionals in the field.