Ashcroft 94539XLL Pressure Gauge 4.5 in Dial 0-15 Psi Rear Flange

Product Description

The ASHCROFT 94539XLL is an analog pressure gauge designed for accurate, reliable pressure measurement in industrial and mechanical systems. Featuring a 4.5-inch dial and a 0 to 15 psi range, it delivers 0.5 percent of scale accuracy, making it suitable for low-pressure monitoring applications. The thermoplastic case provides lightweight durability in environments where a non-liquid-filled gauge is appropriate. This gauge is installed by HVAC technicians, plumbers, and industrial maintenance professionals who need a clear, readable dial with solid mounting stability.

This gauge is well suited for residential and light commercial mechanical systems where low-pressure monitoring is required, including water service panels, boiler systems, compressed air lines, and similar low-pressure fluid or gas circuits. The rear flange mount configuration allows for panel or wall-surface mounting, keeping the dial face flush and fully visible. The 0.5-inch NPT threaded connection fits standard process ports commonly found in these applications.

Key Features

• 4.5-inch analog dial for clear, at-a-distance readings
• 0 to 15 psi pressure range suited for low-pressure systems
• 0.5 percent of scale accuracy for reliable measurement
• Rear flange mount for panel or surface installation
• Thermoplastic case construction — lightweight and corrosion-resistant
• Non-liquid-filled design for standard dry-service environments

Compatibility

Designed as an OEM-style replacement or new-installation pressure gauge for low-pressure mechanical systems requiring a 4.5-inch dial, rear flange mount, and 0.5-inch NPT threaded connection.

Installation Notes

Pressure gauges of this type are installed by licensed plumbers, HVAC technicians, or qualified mechanical contractors. Shut off and depressurize the system fully before removing an existing gauge or installing a new one. Use appropriate thread sealant on the NPT connection and tighten to hand-tight plus a controlled number of turns — avoid over-tightening, which can crack a thermoplastic socket. Verify the system pressure range does not exceed the gauge rating before returning the system to service.