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Hi Tony, No there is no resistance at all. It is the same all the way round. Sometimes you cannot save yourself extra work; I think I am resigned to replacing the whole thing with a Honeywell. Thanks allot for your input though.

Thanks for everyones info and advice. Gas Guru has given me a web address with manufacturers catalogue including a large picture of the internals of this valve. With the head off, I can turn the shaft by hand with virtually no resistance, I would have thought I should have at least felt the...

Thanks a million Gas Guru, your info is greatly appreciated.

It is a three port valve head, you are correct, sorry.

Yes three pipes, to serve hot water and heating.

Thanks Namsag, and Agile for the really quick response. Understand both, thanks allot.

Hi guys I need to replace a two way valve which I have not heard of before. It has the name of 'Duoval Sunvic'. I only want to replace the actuator but will buy the valve to get it. I want to replace like for like to save me extra work. But I need a supplier. Can anyone help please?