Ashcroft 94831XLL Pressure Gauge 4.5 in Dial Rear Flange

Product Description

The ASHCROFT 94831XLL is an analog pressure gauge designed for accurate pressure measurement in industrial, mechanical, and process piping applications. It features a 4.5-inch dial face for easy readability and mounts via a rear flange configuration, making it suitable for panel or surface installations. The gauge has a 0.25-inch thread connection and delivers a stated accuracy of 0.5% of scale across a pressure range of -30 to 0 psi (vacuum range). The thermoplastic case provides a lightweight, corrosion-resistant housing. No liquid fill is used, keeping the unit straightforward to install and service. Licensed contractors and instrumentation technicians are the typical installers for this type of gauge.

This gauge is well suited for vacuum monitoring in residential, light commercial, and industrial environments where a rear flange mount is required for panel or wall installation. The 4.5-inch dial diameter provides clear, at-a-glance readings from a distance, which is useful in mechanical rooms and equipment skids. The dry (no-fill) design makes it appropriate for applications where glycerin or silicone fill is not needed or not permitted. The 0.25-inch threaded connection is a common size in plumbing and process instrumentation systems.

Key Features

• 4.5-inch analog dial face for easy remote readability
• Rear flange mount configuration for panel or surface installation
• 0.5% of scale accuracy for reliable pressure indication
• Pressure range: -30 to 0 psi (vacuum service)
• Thermoplastic case — lightweight and corrosion-resistant
• Dry gauge (no liquid fill) for simplified installation and maintenance

Compatibility

Designed as an OEM-style replacement or new-installation analog pressure gauge for plumbing, HVAC, and light industrial process systems requiring a rear flange mount with a 0.25-inch thread connection.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or instrumentation technician in accordance with applicable local codes. Depressurize and isolate the system completely before removing the existing gauge or making any threaded connections. Apply thread sealant or PTFE tape appropriate for the service pressure and fluid before threading the gauge into the port. Do not over-tighten the threaded connection, as thermoplastic components can crack under excessive torque.