Ashcroft 83174XLL Pressure Gauge 3.5 in 30-0-300 Psi Lower Mount

Product Description

The ASHCROFT 83174XLL is an analog pressure gauge built for accurate compound pressure measurement in mechanical and process systems. It features a 3.5-inch dial face with a 30 to 0 to 300 PSI range, making it suitable for applications that require both vacuum and positive pressure readings on a single instrument. The stainless steel case protects internal components in corrosive or washdown environments. Bronze wetted parts provide reliable performance in contact with common system fluids. Accuracy is rated at 1 percent of full scale. This gauge ships dry with no liquid fill. Licensed technicians and journeymen in HVAC, plumbing, and industrial service install this type of gauge as part of system monitoring and diagnostics setups.

This gauge is suited for residential and light commercial mechanical systems where a durable, mid-size dial is needed at a lower-mount connection point. The lower-mount 1/4-inch thread configuration allows direct panel or pipe installation with the dial face oriented upward for easy reading. The compound scale from 30 inches of vacuum through 300 PSI covers a broad range of system pressures common in refrigeration, hydronic, compressed air, and general plumbing applications. The dry, no-fill design keeps the unit lightweight and avoids fluid leakage concerns in temperature-variable environments.

Key Features

• Compound pressure range: 30 to 0 to 300 PSI on a single dial
• 3.5-inch analog dial for clear, at-a-distance readings
• Stainless steel case for corrosion resistance in demanding environments
• Bronze wetted parts compatible with common system fluids
• 1 percent of full-scale accuracy for reliable system diagnostics
• No liquid fill — dry gauge design reduces weight and eliminates fill-fluid concerns

Compatibility

Designed as an OEM-style replacement or service gauge for mechanical systems requiring a lower-mount, 1/4-inch NPT connection analog pressure gauge with a compound measurement range.

Installation Notes

Installation is typically performed by licensed HVAC technicians, plumbers, or pipefitters. Shut down the system and relieve all pressure before removing an existing gauge or installing this unit. Use appropriate thread sealant on the NPT connection and tighten to a snug fit using a wrench on the gauge body hex — do not torque against the dial case. Follow applicable IPC or IFGC requirements for pressure instrumentation in your jurisdiction.