Isolation valve stuck

[Alex D]

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.

 

[terryplumb]

What you have is a push fit service valve .

 

[Alex D]

Yeah I thought that was the case, I guess there's a way to release the pushfit part? As a replacement would this do the job https://www.screwfix.com/p/jg-speedfit-straight-valve-tap-connector-15mm-x-1-2/77333

 

[terryplumb]

That is one of many that would do the job. Personally I prefer the fully metal ones ,and compression fitting rather than push fit.
Unfortunately they are not all exactly the same length ,and may not reach the float valve ,unless the supply pipework has some vertical free play.
I don't recognise what brand make yours is ,but it appears to be of the type that is released by pushing upward on the ring at the bottom.

 

[Alex D]

Thanks Terry, I'll give it a go over the next few days.