Copper pipe query - 3/4" or 1/2" - ?

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16 Dec 2004
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Hi all,

I'm thinking of replacing a cast iron bath.

The existing bath we have has 1/2" copper pipe for the cold
tap, and 3/4" copper pipe to the hot tap.

Does it make any difference which size of pipe we use ?
 
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Use a 3/4" olive in a 22mm compression fitting, 15mm will fit 1/2" just.

COld is probably from the mains. If you wish to use a shower mixer you should install 22mm coming from CW tank. Otherwise pressure difference causes problems.
 

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