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Black in colour and made from tough plastics, this gas test U-gauge is designed for testing pipework installations with air for leaks before introducing gases. It is also for checking and setting correct gas pressures on relevant domestic and commercial appliances. The extruded cover slides off and clips over the base to allow for vertical standing of the tool and the hanging tab creates vertical hanging from a suitable protrusion.Features & Benefits: Monument 257C Gas Test U-gauge - 12 inch, Marked in millibars the scale adjusts, to zero the water level, Capacity 30mb, Tough plastic material, Standard black in colour, For testing pipework installations. Monument 257C Gas Test U-gauge - 12 inch