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Loctite 55 has now been elevated to the status of magic whereas PTFE has been downgraded to "trump trash" :)

Thank you both. I suspected that. I remade the joint today with PTFE and sure enough it is still weeping. Loctite 55 here I come ...

I apologise if these sound silly questions, but I would love some advice on making threaded fittings weep-proof. I have 1/2" Danfoss Randall RA-G Single Pipe TRV Body which comes with a fitting which screws onto the 1" OD outlet of the TRV and screws into the radiator. (see...

I meant to add the image

Plumbcentre has few options but there are lots of options on eBay where you can also buy the extenders above for twice what Screwfix charges. See http://www.ebay.co.uk/bhp/radiator-valve-extension Toolstation you pointed me to is excellent. They carry the entire range so you can mix and match...

I guess my TRV design goes back to the 1950s as it is a specific single pipe system valve. I was trying to chuck away the adapter which came with the TRV whereas I should have been looking for an adapter which screwed on to the adapter which came with the TRV.

Sorry - I do apologise. :oops: You are quite correct! I did not spot that the extender you pointed to has an internal thread and it was only your "TRV > tail came with it > tail extension you linked to > radiator" comment which allowed me to see how it worked. The picture had it the wrong...

Forgot to add the image. I would like one without the tap!

Thank you for replying. Unfortunately I cannot see how to use it to do what I need but their catalogue has Perfect Pump Valves 22mm at http://www.toolstation.com/shop/p52920 which looks to be what I need if I ignore the valve :) as it looks like it has a 1" O-ring/seal screw fitting on the...

How do I connect a 15mm pipe to a 1" diameter male "O" ring type fitting? See photo. I am replacing an Imperial radiator in a single pipe system with a metric one which is quite a bit shorter. I have bought a 1/2" Danfoss Randall RA-G Single Pipe TRV Body which comes with a chrome fitting...