Ashcroft 81378XLL Pressure Gauge 2.5 in Dial 30-0-100 Psi

Product Description

The ASHCROFT 81378XLL is a 2.5-inch analog pressure gauge designed for industrial and mechanical system monitoring. It features a stainless steel case and bronze wetted parts, making it suitable for use with a range of compatible media. The gauge reads a compound range of 30 inches Hg vacuum to 0 to 100 psi, giving technicians visibility into both negative and positive pressure in a single instrument. Accuracy is rated at 1 percent of scale. The 1/4-inch center back mount configuration allows for direct panel or pipe installation. No liquid fill is used, keeping the gauge lightweight at 0.25 pounds.

This gauge is appropriate for HVAC, plumbing, refrigeration, and light industrial applications where a compact, readable pressure indicator is required. The center back mount is a common configuration for panel-mounted instrumentation and inline service points. Licensed HVAC technicians and plumbers routinely install this type of gauge on suction lines, supply lines, and manifold assemblies where compound pressure readings are needed. The dry (no-fill) design suits environments where vibration is not a primary concern.

Key Features

• Compound pressure range: 30 inches Hg vacuum to 0 to 100 psi on a single dial
• 1 percent of scale accuracy for reliable field readings
• Stainless steel case for corrosion resistance in demanding environments
• Bronze wetted parts compatible with common system media
• 2.5-inch analog dial provides clear, at-a-glance readability
• No-fill design — lightweight and straightforward to service

Compatibility

Designed as an OEM-style replacement or direct-install compound pressure gauge for HVAC, plumbing, and light industrial systems requiring a 1/4-inch center back mount configuration with a 2.5-inch dial.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with applicable local codes. Always depressurize and isolate the system before removing or installing a pressure gauge. Apply an appropriate thread sealant to the 1/4-inch NPT connection and tighten to the fitting without over-torquing the case. Verify that the pressure range of the gauge does not exceed the system operating pressure before returning the system to service.