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Single galv metal chimney cap needed

I have taken out an old woodfire and am leaving the last part of the chimney sticking out through the roof. I need a simple cone-type cap/hat made to cover the end and make it waterproof. It will be permanent. Existing chimney is galv sheetmetal and about 24cm diameter. Something I can screw on with stainless steel small screws is fine. Hoping to get this done ASAP cos I've had no luck getting any roofers to provide a fix and we want to get the roof painted very soon.