Ashcroft 662876002665 Pressure Gauge 300 Psi 3.5 in Npt

Product Description

The ASHCROFT 662876002665 is an analog pressure gauge designed for monitoring system pressure in a wide range of plumbing, HVAC, and industrial piping applications. It features a 3.5-inch dial for clear, at-a-glance readings across a 0 to 300 psi range, making it suitable for moderate- to high-pressure systems. The gauge uses a lower-mount, 1/4-inch NPT threaded connection for direct inline or panel installation. Its thermoplastic case offers lightweight durability in environments where corrosion resistance is a practical concern. Licensed plumbers, HVAC technicians, and pipefitters are the primary installers of this type of instrumentation.

This gauge is well suited for residential and light commercial applications including boiler systems, water supply lines, compressed air lines, and hydronic heating circuits. The 3.5-inch dial size is a common field choice where panel space is limited but readability still matters. Lower-mount configuration places the port at the 6 o'clock position on the gauge body, which works with standard pipe tee fittings and gauge snubbers. The 1/4-inch NPT thread is one of the most widely used thread standards in North American fluid and gas systems, making field replacement straightforward.

Key Features

• 0 to 300 psi analog pressure range for moderate- to high-pressure monitoring
• 3.5-inch dial diameter for clear visibility in field and panel installations
• 1/4-inch NPT lower-mount connection compatible with standard pipe fittings
• Thermoplastic case construction for lightweight corrosion-resistant housing
• Analog dial type requires no power source or wiring

Compatibility

Designed as an OEM-style replacement or service gauge for residential and light commercial fluid and gas piping systems using 1/4-inch NPT lower-mount gauge ports.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician in accordance with applicable local codes and ASME B40.100 guidelines for pressure instrumentation. Depressurize and isolate the system before removing an existing gauge or installing this unit. Apply appropriate thread sealant to the NPT threads, but do not overtighten the thermoplastic-adjacent connection, as excessive torque can crack fittings or distort sealing surfaces. A gauge isolation valve or snubber is recommended upstream to protect the gauge from pressure spikes and to allow future service without full system shutdown.