S
samsg30
Red valve is a bypass valve, nothing to do will filling pressure. Have you got a picture of the tank in loft?
Yes.. I managed to get in loft and there's a small blank tank covered with bit of black polythene but there are no valves at all what so ever. I haven't taken the pipe insulation off to check if someone has fit the compression valve instead which can be turned on/off using screw driver as I was expecting visible lever there. Other picture shows three pipes going up to the loft. One is mains cold water.