| Manufactured from tough plastic |
| Used both for testing pipework installations with air for leaks before the introduction of gas and for checking and setting correct gas pressures on domestic and commercial appliances |
| Extruded cover slides off and may be clipped over the base for standing the tool vertically during use |
| Mb marked scale adjusts for zeroing water level |
| Water gauge pressure in inches or millibars |
| Plastic U tube |