Ashcroft 82137 Pressure Gauge 3.5 in Dial Npt Lower Back Mount

Product Description

The ASHCROFT 82137 is an analog pressure gauge designed for accurate pressure measurement across a range of -30 to 0 to 30 inches Hg (in Hg). It features a 3.5-inch dial for easy reading in the field, a 1/4-inch NPT lower back mount connection, and a stainless steel case that resists corrosion in demanding environments. Accuracy is rated at 1% of scale, making it suitable for applications where reliable vacuum and compound pressure readings are required. HVAC technicians, plumbers, and mechanical contractors install this gauge on equipment where compound pressure monitoring is critical to system performance and diagnostics.

This gauge is well suited for residential and light commercial HVAC, refrigeration, plumbing, and general mechanical systems. The lower back mount configuration allows it to mount flush against panels or equipment faces where a front or side entry connection would interfere with adjacent components. The dry, non-liquid-filled design keeps the gauge straightforward to install and service without concerns about fill fluid compatibility. It is commonly used on manifolds, pump skids, vacuum systems, and process piping wherever a compact compound gauge is needed.

Key Features

• Compound pressure range: -30 to 0 to 30 in Hg for vacuum and positive pressure measurement
• 3.5-inch analog dial for clear, at-a-glance readings in the field
• 1% of scale accuracy for reliable diagnostic and monitoring use
• Stainless steel case provides corrosion resistance in wet or harsh environments
• 1/4-inch NPT lower back mount connection for flush panel or equipment mounting
• Dry (non-liquid-filled) construction simplifies installation and servicing

Compatibility

Designed as an OEM-style replacement or upgrade gauge for residential and commercial systems requiring a 1/4-inch NPT lower back mount compound pressure gauge with a 3.5-inch dial.

Installation Notes

Installation is typically performed by a licensed HVAC technician, plumber, or qualified mechanical contractor. Always isolate and depressurize the system before removing or installing any pressure gauge. Apply thread sealant or PTFE tape to the NPT threads per standard practice, being careful not to overtighten and crack the gauge port. Verify the pressure range of the installed gauge is appropriate for the system before returning to service.