The 0–4 Bar 50 mm Dial Pressure Gauge with 1/4″ Back Entry is an analog pressure indicator designed for monitoring fluid pressure in heating, plumbing, and pressurised systems. The gauge provides a clear visual readout of system pressure in bars, helping technicians and homeowners ensure the system is running within safe and optimal pressure ranges.

Function & Purpose

This pressure gauge measures the internal pressure of a sealed system, such as a central heating loop, expansion vessel, boiler plant, or hydronic circuit. It displays the pressure on a 50 mm diameter dial calibrated from 0 to 4 bar, a common range for residential boiler and heating applications. An accurate pressure reading helps identify issues such as low pressure (which can lead to poor heating performance or pump starvation) or high pressure (which can trigger safety relief valves or stress components). The 1/4″ back entry connection means the pressure port is at the rear of the gauge, allowing a neat installation into panels, manifolds, or filter bodies without protruding the gauge stem.

Compatibility

This gauge is suitable for use with systems that operate in the 0–4 bar pressure range, which includes most domestic and light commercial central heating systems, expansion vessels, and some pressurised hot water circuits. The 1/4″ threaded back entry is compatible with standard gauge ports found on boilers, manifolds, pump stations, filling loops, and filter housings when installed using the correct threaded port and sealing method.

Design & Build Quality

The gauge features a robust mechanical movement and a clear dial marked in bars, making it easy to read at a glance. The 50 mm diameter face provides good visibility, and the back entry connection allows compact, tidy installation. The housing is typically durable and suited to the temperatures and environments found in boiler rooms, plantrooms, or utility areas.

Key Benefits

This pressure gauge helps:

Provide continuous monitoring of system pressure
Alert installers or users to low or high pressure conditions
Support safe and efficient operation of boilers and heating circuits
Assist during commissioning, servicing, and troubleshooting

Ideal Applications

The 0–4 bar, 50 mm pressure gauge with 1/4″ back entry is ideal for use on:

Central heating systems
Boiler pressure readouts
Expansion vessels
Filling loops and boiler manifolds
Hydronic heating panels and filter housings

It’s commonly installed by heating engineers during commissioning and maintenance to ensure the system maintains correct and stable pressure for reliable operation.