Dwyer Instruments lf251-200-4l 200 Psi Pressure Gauge 2.5 in Dial

Product Description

The DWYER INSTRUMENTS lf251-200-4l is a liquid filled industrial pressure gauge designed for demanding process and mechanical system applications. It features a 2.5 inch dial face calibrated to 200 psi, a 0.25 inch male pipe thread (MPT) lower mount connection, and a stainless steel case. Liquid fill dampens pointer vibration and protects internal components from moisture and corrosive atmospheres, extending service life in high-vibration or pulsating pressure environments. Licensed plumbers, pipefitters, HVAC technicians, and industrial maintenance professionals install this gauge type on pumps, compressors, boilers, filtration systems, and hydraulic lines.

This gauge is suited for residential and light commercial plumbing systems, HVAC hydronic loops, compressed air lines, and general industrial process piping where a bottom-entry connection is required. The lower mount orientation allows flush or panel mounting and keeps the dial face fully visible when installed on vertical pipe runs or equipment panels. The 200 psi range covers common water, air, and fluid pressure monitoring needs in typical mechanical room and process environments.

Key Features

• 200 psi pressure range for general industrial and mechanical system monitoring
• 2.5 inch dial face for clear at-a-glance readings
• 0.25 inch MPT lower mount connection for vertical pipe and panel installations
• Liquid filled internals dampen vibration and protect against pulsation-related wear
• Stainless steel case resists corrosion in wet, humid, or mildly aggressive environments

Compatibility

Designed as an OEM-style replacement or new-installation pressure gauge suitable for industrial process piping, HVAC hydronic systems, compressed air distribution, and pump or compressor monitoring applications requiring a 0.25 inch MPT lower mount connection.

Installation Notes

Installation is typically performed by a licensed plumber, pipefitter, or HVAC technician. Shut off and depressurize the system completely before removing or installing any pressure gauge. Apply thread sealant or PTFE tape to male pipe threads per applicable plumbing codes before threading the gauge into the port. Do not over-tighten; use a wrench on the hex fitting body only, never on the case, to avoid damaging internal components.

Technical Specifications

• Pressure Range: 0 to 200 psi
• Dial Size: 2.5 inches
• Connection Size: 0.25 inches MPT
• Mount Type: Lower Mount
• Fill Type: Liquid Filled
• Case Material: Stainless Steel

Standard Information

• Brand: DWYER INSTRUMENTS
• Manufacturer Part Number: lf251-200-4l