Tied the ballcock up and and attached hose to the drain value loads of water comes out for half an hour but cylinder still full?

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attached hose to the drain value loads of water comes out for half an hour but cylinder still full?

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What cylinder?

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Tied the ballcock up

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Why did you do that?

So that the cylinder would not refill, the cylinder is a indirect

You have to put your question in some context. A cylinder can be a can of beans, a petroleum storage tank or a thousand other things.

Where do you leave?

John