Emma
I work for a drainage contractor and we have loads of it lying about the yard - you might want to try any similar type of contractors in your area - or even contact your local water authority - if you tell them what you're after, they might see fit to put you in touch with whatever subbies (sub contractors) they use to renew or repair water mains - you may be able to source some that way.
Good luck

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Rat

British by birth
Scottish by the Grace of God

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