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I think it was @TW who said they went into Wickes and just tried out the Tado sensing head unit on the various TRVs in stock. If this appeals, I think I have a couple of knackered Tados (replaced by the builders who knackered them) or at least some correct thread TRVs lying around you are welcome to to do the same.
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Actually finding the nice metal adapters is really difficult though. And the plastic / printed ones are shiiiiit.
We ended up just changing all of our valves (albeit to bog standard chrome finish, not fancy pants anthracite).
Most box store own brand valves seemed to be m30x1.5 when I shopped for them.
[Edit] What @stevo_com said.
Alternatively, take full advantage of your rights under UK distance selling regs, order stuff, try it, and send it back if it doesn't fit. You may be out the cost of delivery.
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no way of telling if a uk product is made by them
Google images search really helps with this, as does doing some shonky cross matching of product codes, SKU codes, EANs etc.
All the Duratherm stuff, for examples, seems to be made by this Polish company , which suggests that it's all M30x1.5 as standard.
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stevo_com
NotThamesWater
@Mr_Smyth
I can't believe that retailers do not give the thread in the valve specs, even the manufacturers don't have them on the detailed PDF's, have spent more than a couple of hours on google and got nowhere.
You would think that with the increase in smart trv's retailers would update their info so people could buy suitable valves.
some useful info here but most of the stuff is european made and no way of telling if a uk product is made by them
https://www.buildingservicestutor.com/the-big-overview-adapters-for-thermostatic-valves/