Thread: Valve covers
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Old 11th Jan 2018, 8:43 pm   #12
Radio Wrangler
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Location: Fife, Scotland, UK.
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Default Re: Valve covers

There were cans intended to reduce valve envelope temperature.

They were rather like wound up strips of spring steel you opened them up and let them close to grip the glass of the valve. the outside was blackened, the inside grippedthe glass,

David
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