The Rothenberger Plastic U-Gauge Manometer is a 12 inch (300mm) water gauge for reading low pressures in millibar. Liquid in a U-shaped tube moves when pressure is applied to one side, and you read the difference off the scale.

Using the Rothenberger plastic U-gauge manometer

Gas engineers use a U-gauge for tightness testing and for checking working pressure at an appliance. It needs no batteries and gives a clear, direct reading. The case is plastic with a see-through cover, and you can zero it without taking the cover off. Magnetic strips hold it on a boiler casing, and an adjustable strap lets it hang upright.

• Brand: Rothenberger
• Size: 12 inch / 300mm
• Millibar scale, reads up to 30mbar
• Supplied with a sealing cap and a hanging cap

Hang the gauge upright before you take a reading, or it will read wrong. Zero it with both legs open, connect the test hose firmly to the test point, and watch the levels settle. Fit the sealing cap when you pack it away so the liquid stays in. Gas work must only be done by a Gas Safe registered engineer. The manometer section has more.

A manometer at the Glasgow counter

Call in to Plumb Parts, 555 South Street, Glasgow G14 0QX. Times are Mon-Fri 8am-5pm and Sat-Sun 8am-1pm. Orders also go through online.

Specification

• Brand: Rothenberger
• Material: Plastic case with clear cover
• Sizes: 12″ (300mm)
• Suitable for: Reading low gas or air pressures in millibar

Common Questions

Does a U-gauge need batteries?

No. It reads the pressure straight off the liquid column, which is why many engineers keep one as a back up to a digital gauge.

How do I zero the manometer?

Hang it upright, open both legs to air, and set the scale so both levels sit on zero. It can be zeroed without taking the cover off.

Can anyone use it to test a gas supply?

Gas tightness testing belongs with a Gas Safe registered engineer. The gauge is their tool, not a DIY check.