Ashcroft 83203 Vacuum Gauge 3.5in Dial 1/4in Npt Center Back

Product Description

The ASHCROFT 83203 is an analog vacuum pressure gauge designed for systems where measuring negative pressure is critical. It features a 3.5-inch dial with a range of 30 to 0 inches Hg, offering 1% of scale accuracy. The liquid-filled stainless steel case dampens vibration and protects the internal mechanism from pulsation and moisture, making it well-suited for demanding service environments. The 1/4-inch NPT center back mount connection allows direct in-line or panel installation. HVAC technicians, plumbers, and refrigeration mechanics rely on this gauge for vacuum and low-pressure monitoring on pumps, condensers, and piping systems.

This gauge is appropriate for residential and light commercial HVAC, refrigeration, plumbing, and industrial fluid-handling applications. The center back mount configuration suits panel-mount installations or direct connection to manifolds and service ports. The liquid fill reduces needle flutter during system operation, improving readability on active systems. It is sold individually and is a practical replacement or additional gauge for service boards, equipment panels, and portable test rigs.

Key Features

• Vacuum range: 30 to 0 inches Hg for negative-pressure measurement
• 1% of scale accuracy for reliable readings across the full range
• Liquid-filled case dampens vibration and needle flutter
• Stainless steel case resists corrosion in wet or harsh environments
• 1/4-inch NPT center back mount for straightforward panel or inline installation
• 3.5-inch analog dial for clear, at-a-glance readings

Compatibility

Designed as an OEM-style replacement or addition for vacuum and low-pressure monitoring applications using standard 1/4-inch NPT center back mount fittings in HVAC, refrigeration, plumbing, and industrial fluid-handling systems.

Installation Notes

Installation is typically performed by a licensed HVAC technician or plumber. Isolate and depressurize the system before removing or installing any gauge. Apply thread sealant appropriate for the service fluid and pressure range, and tighten to fitting-manufacturer specifications using a wrench on the hex body — do not torque against the case. Verify the gauge range is appropriate for the system before pressurizing.