'Stopcocks' how to make sure they work when you need them.

In an emergency, it is no use finding out then, that your main stopcock does not work. Here is a plumbing tip to make sure it is in a workable condition when you need it.
Included here is a video from loafer of Sheffield, of what can happen if you turn your neighbours water off outside, if they are on the same stopcock as you..

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