Anybody have experience of changing one of these, see photos?
Mine is leaking from the shaft of the tap; it seems to be seized inside so I would prefer a new tap.
I assume it simply unscrews from the incoming pipe? I tried to turn it a little but I could not shift it with 10 inch lever and I am afraid to break it if I use a lot of force?
It seems to screw into a copper ring that is screwed into the wall; I assume that is the end of the water pipe not some sort of fancy fitting, see second photo?
Is the tap also a special Swiss size? As best I can measure the thread into the incoming water pipe it seems to be 0.8in, so slightly over 3/4in!?
Advice welcomed
Yes, it simply unscrews. Use some PTFE tape on the threads when reassembling. It's a standard size and thread, nothing specially Swiss. Just take the old one off and take it to any DIY shop to make sure it's the correct fitting, but yes, it's usually going to be marked as 3/4 inch or 20mm.
1/2" pipe thread, actually:
"0.840 1/2"
"The "pipe thread size" as shown in column 3 of the table below is measured and based on the inside of the pipe. "
https://www.plumbingsupply.com/pipethreadsizing.html
Tom
Great, thanks for the info!
You probably know this but before you unscrew the tap - turn off the mains water and confirm that it's off (and not still coming out of the tap!)
Thanks, I have ptfe tape and, to be on the safe side, some gasket putty!
Did you already change the rubber seal and o-ring inside of it?
Thanks
Already experimented with that, tested some other cold taps were dry and also undid the wash machine hose to check their also.
I agree with the teflon tape advice.
Sometimes the connection will leak nevertheless at first but will stop after a brief period. So just because its wet at first, no need to panic or start over.
The tap is over 30 years old and when I applied a spanner to the nut on the shaft it started to deform
Decided to leave well alone
Confirm it yourself when you are there.
I took an old kitchen tap to Hornbach the other day precisely so I could ensure I would get one with the same fitting.
The guy there said there was only one size for this type of tap. He was wrong and I didn't double-check.
An alternative could be to change the rubber washer in the tap itself.
Been there and done that.
When a guy in a DIY store says there is only one type, what he really means is, we only stock one type.
Yes, I've had cause to fit and/or change about half a dozen in-wall taps like this over the last few months and each time I take the old one, or something that it screws onto, to verify the new bits I'm buying.
Also be aware that some new taps and fittings may not have a long enough shaft/thread to reach the pipe set back in the wall, so a little extension piece may be required, like this one. Under 5chfs at Co-op B&H.
Success
Thanks everyone for your help.
Sadly the cheap extension piece was out of stock in Coop so I finished up buying one that cost more than the tap
In the end I spent around CHF 35,-