Ashcroft 80740XLL Pressure Gauge 4.5 in Dial 0-400 Psi Rear Flange

Product Description

The ASHCROFT 80740XLL is an analog pressure gauge built for industrial and mechanical service applications where accurate, readable pressure measurement is required. Featuring a 4.5-inch dial face, this gauge delivers a 0.5% of scale accuracy rating across a 0 to 400 psi range, making it suitable for systems where close monitoring of pressure conditions is critical. The aluminum case keeps the unit lightweight while bronze wetted parts provide corrosion resistance in contact with common fluids and gases. The rear flange mount configuration allows for direct panel or wall installation with a clean, flush-face appearance. This gauge is not liquid-filled and is intended for relatively vibration-free environments. HVAC technicians, plumbers, and mechanical contractors are the primary installers.

This gauge is well suited for use in commercial and industrial mechanical systems where panel-mounted pressure indication is needed. Typical applications include compressed air systems, water distribution panels, hydronic heating systems, and light industrial process piping. The 0.5-inch connection thread and rear flange mount make it a practical choice for control panel installations and equipment skid assemblies where front-accessible dial readability and secure mounting are both required.

Key Features

• 4.5-inch analog dial face for clear, at-a-distance readability
• 0.5% of scale accuracy across the full 0 to 400 psi range
• Bronze wetted parts for compatibility with water, air, and common process fluids
• Aluminum case construction reduces overall weight
• Rear flange mount design supports flush panel and wall installations
• Non-liquid-filled design suitable for low-vibration service environments

Compatibility

Designed as an OEM-style replacement or new-installation pressure gauge for residential and commercial mechanical systems requiring a 4.5-inch dial, 0.5-inch rear-threaded, flange-mount gauge in the 0 to 400 psi range.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified mechanical contractor in accordance with applicable local codes and system requirements. Depressurize and isolate the system completely before removing an existing gauge or making any threaded connection. Use appropriate thread sealant or PTFE tape on the male threads and avoid overtightening, which can crack the gauge socket or distort the bourdon tube. Mount securely to the flange before returning the system to service and verify zero reading before pressurizing.