Ashcroft 83172XLL Pressure Gauge 3.5 in 30-0-150 Psi Lower Mount

Product Description

The ASHCROFT 83172XLL is an analog pressure gauge built for accurate compound pressure measurement in mechanical and process systems. It features a 3.5-inch dial with a 30-0-150 PSI range, covering both vacuum and positive pressure readings on a single scale. The stainless steel case offers corrosion resistance in harsh environments, while the bronze wetted parts suit a broad range of compatible media. Accuracy is rated at 1 percent of scale, meeting typical trade requirements for HVAC, plumbing, and light industrial applications. Installation requires no liquid fill, keeping maintenance minimal. Licensed plumbers, HVAC technicians, and pipefitters are the primary installers of this type of gauge.

This gauge is suited for residential and light commercial installations where a reliable, dry-fill compound gauge is needed at a system port or manifold. The lower-mount configuration places the 0.25-inch NPT connection at the bottom of the gauge body, making it a straightforward fit for panel-mount or direct pipe installations. Common applications include boiler systems, compressed air lines, refrigeration equipment, and hydronic heating circuits where monitoring both vacuum and positive pressure is required.

Key Features

• 3.5-inch analog dial for easy at-a-glance readings in the field
• Compound range of 30-0-150 PSI covers vacuum and positive pressure on one gauge
• 1 percent of scale accuracy for reliable system diagnostics
• Stainless steel case provides corrosion and impact resistance
• Bronze wetted parts compatible with a wide range of system media
• No-fill design eliminates liquid maintenance and simplifies installation

Compatibility

Designed as an OEM-style replacement or new-installation gauge for HVAC, plumbing, and light industrial systems requiring a lower-mount, dry-fill compound pressure gauge with a 0.25-inch NPT connection.

Installation Notes

This gauge is typically installed by licensed plumbers or HVAC technicians following applicable IPC and IFGC code requirements. Depressurize and isolate the system completely before removing or installing any pressure gauge. Apply thread sealant appropriate for the system media to the NPT threads before installation. Do not over-torque the gauge body, as this can damage the bourdon tube or case.