I wish to put a shower at the opposite end of the bath to the taps, consequently I need to run cold water mains under the bath and up the wall at the opposite end.
Can I convert from 15mm copper to pvc pushfit using a tee, run a flexible pipe under the bath then convert that to a chromed copper pipe to run up the wall to the shower.
What are those conversion tee,s called and where can I purchase one?
Just use a standard compression joint and use the correct insert for the plastic as recommended by the pipe manufacturer. No need for a special conversion fitting.
I assume that that the cold feed to the bath is at mains pressure, and that you're planning to install an electric shower?
As far as tees go, you have a choice - and you don't need any special conversion fittings. The easiest is probably to use push-fit all the way, as this will work with the existing copper pipe and with the flexible plastic pipe. [Don't forget the insert in the end of the plastic pipe, and the cut ends of the copper pipe must be spotlessly clean].
Equally, a conventional compression fitting will work on both types of pipe - again with an insert in the plastic pipe.
Do you *really* want an electric shower? If you have a source of stored hot water, you'll get a far better flow by using a mixer shower with a booster pump - taking the hot feed from the bath supply(**), and the cold feed from the cold header tank.
** Purists will tell you that you should have an independent hot feed from the hot cylinder - but this is often not necessary.
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