Ashcroft 91480XLL Pressure Gauge 4.5 in Rear Flange

Product Description

The ASHCROFT 91480XLL is an analog pressure gauge designed for industrial and mechanical service applications where accurate, at-a-glance pressure readings are required. It features a 4.5-inch dial face with a 0 to 100 psi range and a stated accuracy of 0.5 percent of scale, making it suitable for applications that demand consistent measurement reliability. The aluminum case keeps weight low at 2.5 pounds while the bronze wetted parts provide corrosion resistance in contact with the process media. This gauge mounts via a rear flange configuration and connects through a 0.5-inch threaded port. Licensed technicians and pipefitters in HVAC, plumbing, and industrial process environments are the primary installers.

This gauge is appropriate for use in residential and light commercial mechanical systems where pressure monitoring of water, air, or compatible fluids is required. The rear flange mount suits panel or bulkhead installations where the gauge face must sit flush against a surface. Its dry, no-fill design means there is no glycerin or silicone liquid inside the case, which simplifies disposal and keeps the unit lightweight. The 0.5-inch thread connection is a common size across a wide range of valves, manifolds, and test ports found in HVAC and plumbing service work.

Key Features

• 4.5-inch analog dial face for easy pressure reading at a distance
• 0 to 100 psi pressure range with 0.5 percent of scale accuracy
• Aluminum case construction reduces overall weight
• Bronze wetted parts resist corrosion from process media contact
• Rear flange mount design for panel and bulkhead installations
• Dry, no-fill construction — no liquid inside the case

Compatibility

Designed as an OEM-style replacement or service gauge for residential and commercial mechanical systems requiring a rear flange-mounted analog pressure gauge with a 0.5-inch threaded connection and a 4.5-inch dial face.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or pipefitter in accordance with applicable local codes and IPC or IFGC guidelines. Isolate and depressurize the system fully before removing an existing gauge or making any threaded connections. Use appropriate thread sealant or PTFE tape on the threaded port and tighten to hand-snug plus a firm wrench turn — do not over-torque the aluminum case fittings. After installation, slowly restore system pressure and inspect for leaks before returning the system to service.