Ok I have had a bar in my shed for over 12 months and the c02 for my carling has always been set to 20 psi, however the last month or so it seems as though there’s not enough pressure. The tap pushes back easily like theres no pressure with no cluncking sound. If I turn the gas up to 25 -26 psi its ok again but I’am then getting about a 2inch head on my beer. I have just fitted a brand new mini remote cooler and theres an extra cold pod under the counter. I have also just purchased a gas pressure test gauge and my psi setting are all correct.