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Its definitely the correct way, i removed it so any crap that was in the pipe got washed away. The pipe leading to the radiator is hot and the other one leading to the gravity valve is cold with the arrow pointing up with the flow. Having take the old one off the valve was working fine before...

Quick update, it was a check valve, it did have an arrow point up to the first floor. I bled the system down and changed with another check valve as it was a one for one swap without changing the olive etc. having taking the old one off and blown through it, it is woking fine, (no resistance in...

yea he did flush the system as he had all the cleaning kit that came with the new boiler. I will drain it down again today take it off and investigate and change it with what i think it is. Would it matter do you think if i put a straight compression on there ?

Is that what you think it is ? an isolation valve? i thought it was some kind of anti gravity/check valve? at the moment it is seeping from the tiny screw. Thinking of just replacing it with a straight coupling as i have a filling loop now with the new boiler ? whats your thoughts

Thanks for your reply Ian, Sorry for the quality. Ive tried looking for the same item but can't find anything like it. I thought to stay safe i would replace like for like. That feed is going to a radiator that is downstairs, I think its the last one in the loop and doesn't get hot so i am...

Can anyone tell me what this is? is it a check valve? Do i need this with a combo boiler ? My boiler system has been replaced with a combi boiler so do i even need this ?? any help would be great