Black mains water pipe

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I have just bought a 1960's bungalow which has original black (plastic/rubber?) underground mains waterpipe.

Is this the type which does not burst when frozen, and will it be ok to leave this without renewing it?
 
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If it ain't broke, why fix it?

Water service pipes are (or should be) buried deep enough underground to avoid winter frosts, so they don't freeze and burst.

Any pipe may be vulnerable to frost if it is run through unheated voids under the floor or in lofts without insulation/protection.

If you wish to make any changes to your plumbing, getting 'original' fittings for older Imperial pipe sizes may be problematic, but adaptors to convert to common metric sizes and modern materials are available.

The pipe itself may have aged, and become somewhat more brittle than when it was first installed, but that is probably of little consequence if you don't need to disturb it.

Sometimes larger bore service pipes, capable of delivering higher flow rates are required to make best use of unvented hot water systems.
 
The pipe does run under the ground floor void and is not insulated.

What I was really wondering was whether it would freeze but not burst, as the modern blue pipe?
 

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