Ashcroft 94889 Pressure Gauge 2.5 in 100 Psi Npt Back Mount

Product Description

The ASHCROFT 94889 is an analog pressure gauge designed for accurate pressure monitoring in plumbing, HVAC, and industrial piping systems. It features a 2.5-inch dial face with a 0 to 100 psi range and delivers 1 percent of scale accuracy across that range. The stainless steel case provides corrosion resistance in demanding service environments. The gauge mounts via a 1/4-inch NPT center back connection, making it straightforward to install inline or on a manifold port. Licensed plumbers, HVAC technicians, and pipefitters install this type of gauge for system commissioning, pressure testing, and ongoing operational monitoring.

This gauge is suited for residential and light commercial applications where a compact, reliable pressure indicator is needed. Typical installations include boiler systems, chilled water loops, compressed air lines, water supply lines, and hydronic heating systems. The dry (non-liquid-filled) construction keeps the design simple and weight low, appropriate for stable environments without heavy vibration or pulsation. The 2.5-inch dial provides a readable display in tight mechanical rooms or panel installations.

Key Features

• 0 to 100 psi pressure range suitable for common plumbing and HVAC system pressures
• 1 percent of scale accuracy for reliable pressure readings
• 2.5-inch analog dial for clear, at-a-glance readability
• Stainless steel case resists corrosion in wet or chemically active environments
• 1/4-inch NPT center back mount fits standard gauge ports and manifold taps
• Dry (non-liquid-filled) design for low-vibration service environments

Compatibility

Designed as an OEM-style replacement or direct-install pressure gauge for residential and light commercial systems using 1/4-inch NPT gauge ports, including boilers, hydronic loops, compressed air systems, and water supply piping.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician following applicable local codes and ASME B40.100 gauge installation guidelines. Depressurize and isolate the system before removing or installing any gauge. Apply thread sealant or PTFE tape to the NPT threads before hand-tightening, then snug with a wrench — do not overtighten, as this can crack the gauge socket or distort threads. For systems with significant pressure pulsation, consider adding a snubber or isolator valve at the gauge port.