The arctic hayes u flow water gauge is a dual scale flow measurement tool designed for plumbers and heating engineers testing water system performance. Its transparent body design ensures clear, accurate readings when measuring flow rates during boiler installations, system upgrades, and commissioning work. This essential diagnostic tool features opposing flow rate scales on each side of the body, allowing you to measure water flow in either litres per minute or gallons per minute without conversion calculations. The see through construction makes it simple to monitor water movement and obtain precise measurements quickly. Ideal for new installation preparation and system testing, the u flow water gauge provides the accurate flow data needed to ensure heating systems meet manufacturer specifications. The gauge is compatible with the 998731 stem thermometer, enabling simultaneous flow rate and water temperature testing for comprehensive system diagnostics. Features and benefits bull clear transparent body for easy reading and accurate measurements bull dual scale design measures in both litres and gallons per minute bull compatible with 998731 stem thermometer for combined flow and temperature testing bull simple operation makes it ideal for quick system diagnostics specifications tool type u gauge flow measure range 4 22 litre, 1 5 gallon