Ashcroft 94591XLL Pressure Gauge 3.5 in Dial 1/4 in Lower Mount

Product Description

The ASHCROFT 94591XLL is a dry analog pressure gauge designed to measure vacuum pressure from -30 to 0 Hg. It features a 3.5-inch dial for easy readout, a 1/4-inch lower-mount thread connection, a stainless steel case, and bronze wetted parts. With 1% of scale accuracy, this gauge is built for field and mechanical room installations where reliable vacuum readings are required. HVAC technicians, plumbers, and mechanical contractors use this type of gauge to monitor system vacuum levels on refrigeration, HVAC, and plumbing applications.

This gauge is suited for residential and commercial applications where vacuum or low-pressure readings are needed. The lower-mount configuration positions the connection at the bottom of the dial, making it a natural fit for panel-mount or pipe-top installations. The dry, no-fill design keeps installation straightforward without the handling considerations of liquid-filled units. The stainless steel case provides durability in typical mechanical environments, while the bronze wetted parts are compatible with common system media.

Key Features

• Vacuum pressure range: -30 to 0 Hg for monitoring system vacuum levels
• 3.5-inch analog dial for clear, at-a-glance readout
• 1/4-inch lower-mount thread connection for standard pipe or panel installation
• 1% of scale accuracy for reliable field measurements
• Stainless steel case for corrosion resistance in mechanical environments
• Bronze wetted parts compatible with common plumbing and HVAC media
• Dry, no-fill design simplifies installation and handling

Compatibility

Designed as an OEM-style replacement or add-on gauge for residential and commercial HVAC, refrigeration, and plumbing systems requiring vacuum pressure monitoring via a 1/4-inch lower-mount connection.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with applicable local codes. Isolate and de-pressurize the system before removing or installing any pressure gauge. Use appropriate thread sealant on the 1/4-inch NPT connection and do not overtighten, as this can damage the gauge socket or case. Verify the pressure range of the gauge is appropriate for the system before placing into service.