Ashcroft 662876113590 Pressure Gauge 3.5 in Npt Center Back

Product Description

The ASHCROFT 662876113590 is an analog vacuum pressure gauge designed for measuring negative pressure in HVAC, refrigeration, plumbing, and industrial service applications. It features a 3.5-inch dial for easy field readability and connects via a 1/4-inch NPT center back mount, allowing direct installation into pipework or manifold ports. The steel case provides durable enclosure suitable for demanding service environments. The measurement range runs from -30 to 0 inches of mercury (Hg), making it appropriate for vacuum and low-pressure monitoring tasks performed by licensed HVAC technicians, plumbers, and pipefitters.

This gauge is suited for residential and light commercial service where vacuum or negative pressure readings are required. Typical installations include suction-line monitoring, evacuation verification on refrigerant systems, and vacuum testing on plumbing assemblies. The center back mount orientation integrates cleanly into panel-mounted or pipe-threaded fittings without requiring an elbow adapter, keeping the installation compact and inline.

Key Features

• 3.5-inch analog dial for clear reading at typical working distances
• 1/4-inch NPT center back mount fits standard pipe thread connections
• Vacuum range of -30 to 0 Hg suitable for evacuation and vacuum monitoring
• Steel case construction for durable field use
• Compact form factor compatible with panel-mount and direct pipe-thread installations

Compatibility

Designed as an OEM-style replacement or service gauge for systems requiring a 1/4-inch NPT center back mount analog vacuum gauge with a 3.5-inch dial and a -30 to 0 Hg measurement range.

Installation Notes

Installation should be performed by a licensed HVAC technician, plumber, or pipefitter familiar with pressure instrumentation. Isolate and depressurize or evacuate the system fully before installing or removing the gauge. Apply thread sealant appropriate for the service fluid to the NPT threads, taking care not to obstruct the port opening. Verify that the system pressure range does not exceed the gauge rating before returning the system to service.