Ashcroft 80257XLL Pressure Gauge 4.5 in 30-0-300 Psi Rear Flange

Product Description

The ASHCROFT 80257XLL is an analog pressure gauge designed for industrial and mechanical system monitoring where accurate, reliable pressure readings are essential. With a 4.5-inch dial and a compound pressure range of 30 inches Hg vacuum to 0 to 300 psi, this gauge provides clear readability across a wide measurement span. The wetted parts are stainless steel, making it suitable for use with mildly corrosive media. The aluminum case keeps overall weight low at 2.5 pounds. Accuracy is rated at 0.5 percent of scale. Licensed HVAC techs, plumbers, and pipefitters working on pressurized systems will find this gauge a practical fit for both service and permanent installation applications.

The 80257XLL is suited for residential and light commercial HVAC, plumbing, and mechanical system installations where a rear flange mount configuration is required. The rear flange mount allows the gauge to be panel-mounted or surface-mounted flush against a wall or enclosure, keeping the face visible and accessible. The 0.5-inch NPT rear connection threads directly into standard pipe fittings. The non-liquid-filled design is appropriate for environments where vibration is not a primary concern. This gauge is commonly installed on boiler systems, compressed air lines, water supply systems, and similar pressurized piping applications.

Key Features

• Compound pressure range: 30 inches Hg vacuum to 0 to 300 psi on a single dial
• 4.5-inch analog dial for easy reading at distance
• Stainless steel wetted parts resist corrosion from many common system fluids
• Aluminum case construction reduces overall weight
• Rear flange mount simplifies panel and surface installation
• 0.5 percent of scale accuracy for dependable pressure monitoring

Compatibility

Designed as an OEM-style replacement or new-installation analog pressure gauge for pressurized piping systems requiring a 0.5-inch NPT rear-mount connection and a 4.5-inch dial with compound pressure range capability.

Installation Notes

Installation is typically performed by a licensed plumber, pipefitter, or HVAC technician. Depressurize and isolate the system completely before removing an existing gauge or threading in a new one. Apply appropriate thread sealant or PTFE tape to the NPT threads per local plumbing code requirements. Do not over-tighten the gauge connection, as this can damage the socket fitting or crack the case.