Wika 4256000 Pressure Gauge 4 in Dial 1/4 Npt 0-100 Psi

Product Description

The WIKA 4256000 is an analog pressure gauge designed for measuring system pressure in plumbing, HVAC, and industrial fluid-handling applications. It features a 4-inch dial with a 0 to 100 psi pressure range and a 3-2-3 percent of scale accuracy rating, making it suitable for general-purpose pressure monitoring where precise mid-scale readings matter most. The gauge uses a lower-mount, 1/4-inch NPT connection for direct inline or panel installation. The ABS case houses brass wetted parts, providing corrosion resistance with common water and air media. Licensed plumbers, HVAC technicians, and mechanical contractors are the typical installers.

This gauge is suited for residential and light commercial systems where a no-fill, dry-dial instrument is appropriate. Typical applications include boiler pressure monitoring, compressed air systems, water supply lines, and chilled or condenser water circuits. The lower-mount NPT connection allows vertical stem installation directly into a pipe fitting or manifold port. The 4-inch dial provides a clear reading from a short working distance, practical in mechanical rooms or equipment rooms with moderate lighting.

Key Features

• 4-inch analog dial with 0 to 100 psi pressure range
• 3-2-3 percent of scale accuracy for reliable mid-range readings
• 1/4-inch NPT lower-mount connection for straightforward inline installation
• Brass wetted parts for compatibility with water and air service
• ABS case construction — lightweight and impact-resistant
• No-fill (dry) dial configuration — no glycerin or silicone fill

Compatibility

Designed as a general-purpose replacement or new-installation pressure gauge for systems using 1/4-inch NPT lower-mount connections with media compatible with brass wetted parts.

Installation Notes

Installation should be performed by a licensed plumber or qualified mechanical technician. Shut off system pressure and bleed the line to zero before removing or installing the gauge. Apply thread sealant or PTFE tape to the NPT threads per local plumbing code requirements — do not overtighten, as ABS cases can crack under excessive torque. This is a dry-dial gauge and should not be used on high-vibration applications without adding an external snubber or isolator.