3-1/8" Blue Compound Dry Manifold Gauges

Yellow Jacket 49138 3-1/8" Blue Compound Gauge – Dry, Steel Case, R-22/R-404A/R-410A Compatible

The Yellow Jacket 49138 compound pressure gauge is engineered for use in manifold sets where durable construction and accurate system readings are critical. Designed with a 3-1/8" dial face and a dry configuration, this gauge provides reliable performance across a range of standard refrigerants, including R-22, R-404A, and R-410A.

Constructed with a steel case and a polycarbonate lens, the 49138 is built to endure the demands of frequent field use. The gauge features color-coded, easy-to-read refrigerant temperature scales and includes Flutterless™ technology to minimize pointer vibration, delivering improved reading stability during system charging or diagnostics.

Key Features

• Compound Pressure Range: Measures both pressure and vacuum
• Flutterless™ Mechanism: Dampens needle oscillation for smoother readings
• Multi-Refrigerant Scales: Calibrated for R-22, R-404A, and R-410A with temperature in °F and °C
• Steel Case with Brass Internals: Designed for rugged job site conditions
• Front Calibration Screw: Allows field adjustment for continued accuracy

Specifications

• Gauge Diameter: 3-1/8 inches
• Lens Material: Polycarbonate
• Case Material: Steel
• Connection Size: 1/8" NPT lower mount
• Pressure Scale: PSI (inner) / inHg (outer for vacuum)
• Temperature Scales: °F and °C

Usage and Application

Designed for HVAC technicians working on systems charged with R-22, R-404A, or R-410A, the Yellow Jacket 49138 gauge supports accurate pressure measurement for installation, maintenance, and troubleshooting tasks. The compound design makes it suitable for both low-side pressure and vacuum readings.

Installation Considerations

The gauge is compatible with most standard manifold sets using a 1/8" NPT connection. Always verify proper sealing and ensure the system is depressurized before installation or removal. Routine recalibration is recommended for high-usage environments to maintain accuracy.