Good Morning. I filled up the Gaslow 11kg cylinder on my new motor home yesterday (It would only take £11.47), rushed home to make a cup of tea, turned on the valve cylinder valve, opened the valve under the hob- then nothing, there is no gas coming through. Looking on the Gaslow website I am wandering if there is air trapped in the cylinder, if so they suggest opening the cylinder to the atmosphere. There are 2 buttons one yellow and one red, I’m not sure what these are for. At the moment I have only 1 cylinder as my original plan was to have an ordinary cylinder as well, but I am now thinking I may get another Gaslow cylinder. The system was supplied and fitted by the dealer. Any suggestions gratefully received. How do I open the cylinder to the atmosphere?