Hi, I fixed an issue with my cistern so had turned off the water via the isolation valve, now the valve is stuck closed. Thought it would be best to replace the valve as it's 10+ years old. Bought a standard 15mm isolation valve from Screwfix and then when I checked they been look different. The one I'm replacing screws onto a thread on the bottom of the cistern and also looks like one end is pushed onto the Flexi piping. Where can I get the correct replacement part from and how do I remove the old one from the Flexi piping? Couple of pics, one of the valve I'm trying to replace and one of the thread in the cistern it screws onto.
