3-1/8" Pressure Gauge,0-800 PSI, Red

Yellow Jacket 49137 – 3-1/8" High-Pressure Gauge, Red, 0-800 PSI

The Yellow Jacket 49137 is a 3-1/8 inch diameter pressure gauge designed for accurate high-side pressure measurement in HVAC/R systems. Featuring a 1% accuracy rating (ANSI Grade 1), this gauge is built for field reliability and diagnostic precision. It includes a full-view polycarbonate crystal lens, a front recalibration screw, and a durable steel case for use in demanding service conditions.

Suitable for use with manifold gauge sets or direct system mounting, the 49137 is color-coded red for high-pressure applications and includes easy-to-read R-22, R-404A, R-410A, and R-134a temperature scales. The gauge is equipped with a standard 1/8" NPT male connection and supports recalibration in the field.

Features

• Gauge Size: 3-1/8 inch face diameter for clear readability
• Pressure Range: 0 to 800 PSI for high-pressure system diagnostics
• Accuracy: ANSI Class 1 (±1%) for reliable measurements
• Connection: 1/8" NPT Male bottom connection
• Temperature Scales: Includes refrigerant scales for R-22, R-404A, R-410A, and R-134a
• Construction: Steel case with polycarbonate crystal and brass internals
• Recalibration: Front-mounted screw for user calibration adjustment

Technical Specifications

• Model: 49137
• Pressure Range: 0–800 psi
• Dial Diameter: 3-1/8 inches
• Connection Size: 1/8" NPT male
• Scale: Pressure with refrigerant temperature scales (multiple refrigerants)
• Case Color: Red (designated for high-side service)
• Accuracy: ±1% full scale

Usage Notes

This gauge is compatible with standard Yellow Jacket manifold bodies and other assemblies using 1/8" NPT fittings. Calibration should be verified periodically, especially in high-cycle service environments. The polycarbonate lens and steel case provide protection from impact and environmental wear, but exposure to extreme temperatures or chemical agents should be avoided to maintain accuracy.

Application

• High-side pressure measurement for HVAC and refrigeration systems
• Use with compatible Yellow Jacket or equivalent manifold sets
• Suited for service technicians performing installation, diagnostics, or charging

Summary

The Yellow Jacket 49137 is engineered for precision and durability in HVAC service environments. With a broad pressure range, multiple refrigerant compatibility, and ANSI Class 1 calibration, this gauge supports accurate system monitoring and diagnostics. Built for long-term reliability with field-serviceable recalibration.