How to renew the roof tank ballcock if you have an overflow running.Or a water hammer noise

How to change the ball valve/ballcock in your cold water storage tank in the loft. Just follow this video it`s easy, save money on expensive plumbers.
Buy the correct ball cock from my Amazon link on my website. Al.
Here is the latest 2019 Amazon link. amzn.to/2qKuFIB
For plumbing spares visit my Amazon shop at www.amazon.co.u...
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Im skint so thanks, Al.
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