Advice on getting the correct fittings - installation of bath taps

[elsmandino]

Hi there.

I am just putting in a new bath and, having removed the old one, I have noticed that the hot tap is connected to a 22mm pipe and the cold is 15mm pipe.

I need to connect both to the new taps (3/4") with flexihose but, I have just come back from Screwfix and noticed that they won't fit - the ends are compression fitings for the pipework.

Any advice on what to get would be much appreciated.

Ideally, I would have liked flexihoses with screw ends but I am not sure they even exist.

 

[Laurieo]

Some thing like this
https://www.screwfix.com/p/flomasta-brass-compression-adapting-female-coupler-15mm-x-3-4-/38542
or if you still have the original fittings join on from there.

 

[Madrab]

1st thing - the pipework needs looked at.

There is heavy corrosion in all the pipework in the pics and I would recommend that it is removed and replaced as I'm sorry to say that is a nightmare waiting to happen. When copper gets to that colour it is quite critically corroded.

Nothing new about a mix of pipe sizes - 22mm hot would have been from the HW cylinder fed by a gravity system and it is that size to maximise flow, the cold would possibly have been a mains supply. To use a flexi - you would need to obtain the old compression nuts that came off those fittings, cut out the old pipe and olive, add in a stub of new pipe with an ISO and then attach the flexis to that.

As suggested though, I would highly recommend replacing all the corroded pipework and the fittings and then create new stubs for the compression ends of the flexi to be attached with ISO's - Is the system all mains now, if not then flow may be affected by using flexi's.

 

[elsmandino]

Thanks guys - much appreciated.

I am pretty concerned about the pipes, now.

How much of this need replacing?

As a general guide, what am I looking for that suggests that copper piping has had it?

 

[Madrab]

The green on the pipework is copper oxide - it can be just down to the environment or where flux from soldering hasn't been cleaned off properly but when you see that blushed rosy/red colour underneath then that's where the copper is a little more than just a patina. Sometime it's where the flux from soldering hasn't been cleaned properly and it can eventually pinhole the metal but in your case I think it may be down to the proximity of the loose 'crete that may be causing it, some of the older 'crete's had additives that could cause copper corrosion.

Not all greening is a problem and can just be a natural patina process but if I saw that, I would look to replace at least some of it I would think.