Wika 4253175 Pressure Gauge 0-400 Psi 2.5in Dial Lower Npt

Product Description

The WIKA 4253175 is a commercial-grade analog pressure gauge with a 2.5-inch dial, designed for inline pressure monitoring across a wide range of mechanical, HVAC, plumbing, and industrial service applications. It reads 0 to 400 psi on a single-scale dial and connects via a 1/4-inch NPT lower-mount fitting. The case is molded from ABS plastic with a plastic lens, keeping weight low at 0.2 pounds. Wetted parts are brass, making it suitable for most water, air, and light oil systems. Accuracy is rated at 3-2-3 percent of full scale, meaning the middle portion of the range reads tighter than the ends.

This gauge is intended for commercial pressure monitoring where a compact, no-fill analog instrument is needed. The lower-mount configuration positions the process connection directly below the dial, which suits panel-mount, pipe-tee, or manifold installations. It is commonly installed by plumbers, HVAC technicians, and pipefitters on air compressors, water lines, boiler systems, and pump outlets requiring a reliable visual pressure reference up to 400 psi.

Key Features

• 0 to 400 psi single-scale analog dial for broad pressure monitoring range
• 2.5-inch (63 mm) dial diameter for clear at-a-glance readability
• 1/4-inch NPT lower-mount connection for panel or pipe-tee installation
• Brass wetted parts compatible with water, air, and light oil service
• ABS case with plastic lens — lightweight at 0.2 pounds
• No-fill dry gauge design requires no glycerin or silicone fill
• 3-2-3 percent of scale accuracy meets commercial service requirements

Compatibility

Designed as an OEM-style replacement or service addition for commercial pressure gauge applications requiring a 1/4-inch NPT lower-mount connection with a 2.5-inch dial and a 0 to 400 psi range.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipefitter in accordance with applicable local codes and ASME B40.100 guidelines for pressure gauges. Depressurize and isolate the line completely before removing any existing gauge or installing this unit. Use thread sealant rated for the service medium on the NPT threads and tighten to snug — do not overtighten an ABS-cased gauge. Verify the operating pressure of the system stays within the gauge range; sustained readings above 75 percent of full scale can shorten service life.