Ashcroft 91546XLL Pressure Gauge 4.5 in Dial 0-300 Psi

Product Description

The ASHCROFT 91546XLL is an analog pressure gauge built for accurate pressure measurement in demanding trade applications. Featuring a 4.5-inch dial and a rear flange mount configuration, this gauge delivers a clear, readable display suited for panel or wall installations. Wetted parts are stainless steel, making this unit appropriate for systems where corrosion resistance matters. The aluminum case keeps overall weight down at 2.5 pounds. With an accuracy rating of 0.5 percent of scale across a 0 to 300 psi range, this gauge meets the precision requirements of HVAC, plumbing, and industrial service work.

This gauge is suited for residential and commercial installations where a rear-mounted, flange-style panel gauge is required. Typical applications include boiler systems, compressed air lines, water supply monitoring, and hydronic heating circuits. The rear flange mount allows secure panel mounting with the dial face flush to the surface, a common requirement in mechanical rooms and equipment enclosures. The no-fill, dry-dial construction makes it straightforward to install in environments where a liquid-filled gauge is not specified.

Key Features

• 4.5-inch analog dial for easy field reading at distance
• 0 to 300 psi pressure range covers a wide range of trade applications
• 0.5 percent of scale accuracy for reliable, repeatable readings
• Stainless steel wetted parts for corrosion resistance in water and air service
• Aluminum case construction reduces overall weight
• Rear flange mount design for secure panel installation
• Dry, no-fill dial — no liquid fill to contain or manage

Compatibility

Designed as an OEM-style or direct-replacement analog pressure gauge for panel-mount applications in HVAC, plumbing, boiler, and compressed air systems requiring a 4.5-inch rear flange mount gauge with a 0 to 300 psi range.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified mechanical contractor. Isolate and depressurize the system completely before removing any existing gauge or installing this unit. Use appropriate thread sealant on the connection fitting per applicable IPC or IFGC requirements, and verify the thread size matches the port before installation. Do not overtighten the connection; hand-snug plus a controlled turn with a wrench is the standard practice for gauge fittings.