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What is the diameter of radiator hoses on Ford model A?

Ford Model A radiator hoses aren't a single, standardized diameter. The size varies slightly depending on the year of manufacture and the specific application (upper vs. lower hose). However, they generally fall within the range of 1 inch (internal diameter) for both upper and lower hoses. You'll need to measure your existing hoses or consult a Model A parts catalog for the most accurate dimensions before purchasing replacements. Slight variations from 1 inch are possible.