The Gauge will show you the pressure of the gas in the cylinder. It can also be used to test for a inline leak and will give you 1-2hrs warning of the gas running out.
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IGT 37mbar Propane Gas Regulator
Fits Calor Gas & Flogas RED propane cylinders
47kg, 19kg, 13kg, 11kg, 6kg, 3.9kg
Ideal for use with bbq, Patio heater, cookers, Caravans and Camping stoves