Description

Essential Gas Pressure Diagnostics with the Monument 257C

The Monument 257C Gas Test Gauge is the professional standard for gas pressure measurement in the UK. At ECO Heat Shop, we emphasize that system safety is the first step toward a sustainable home. This 300mm (12-inch) U-gauge is specifically engineered to identify leaks in new pipework and to ensure that boilers, cookers, and fires are burning fuel at the manufacturer’s specified pressure—maximizing both safety and energy efficiency.

Constructed from impact-resistant plastics, the 257C is built to survive the rigours of site work. It is uniquely designed for ease of use, featuring a hanging tab for vertical mounting and a sliding cover that protects the scale during transit but transforms into a sturdy floor stand during testing.

Key Features & Professional Benefits

• Adjustable Zero Scale: The millibar scale can be easily adjusted to zero the water level, ensuring 100% accuracy for every let-by and tightness test.
• Hands-Free Operation: The extruded cover can be clipped onto the base to stand the tool vertically on the floor, or you can use the built-in tab to hang it from a convenient protrusion.
• LPG & Natural Gas Compatible: When paired with the correct nitrile hose, this gauge is suitable for testing both natural gas and LPG systems (Natural gas 30mbar limit).
• Durable U-Tube: The clear plastic U-tube is resistant to clouding and breakage, providing a long-lasting alternative to traditional glass manometers.

Technical Specifications

• Model Number: 257C / MON257.
• Pressure Range: 0 – 30 Millibar (30mb).
• Gauge Height: 300mm (12 inches).
• Material: Tough, high-visibility plastic.
• Hose Compatibility: Standard 1/4″ rubber or nitrile gas testing hose.
• Origin: Manufactured in the United Kingdom.

Why Choose Monument Tools from ECO Heat Shop?

As a specialist UK-registered hardware provider (Company No: 16383897), we only stock tools that meet the highest regulatory standards. The Monument 257C is a “must-have” for any registered Gas Safe engineer. By ensuring correct gas pressures and sealed installations, you help reduce fuel waste and prevent hazardous emissions. We offer fast UK delivery and expert support on our entire range of gas testing and plumbing hardware.

Expert Tip: For the most accurate reading, always ensure the gauge is perfectly vertical. If you are testing LPG systems, remember to use a black nitrile hose (such as Monument 1279Y) to prevent the hose material from degrading over time.

ECO Heat Shop: Your trusted UK partner for professional gas testing instruments, sustainable heating components, and expert-grade plumbing tools.

Additional information