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Assuming that your tube has an INSIDE diameter of 3 inches, then the volume will be that of a cylinder. V = (pi)r2h = 3.14159x(1.5)2x36 = 254.46879 cubic inches

231 cubic inches = 1 gallon, so divide, 254.46879 / 231 = 1.10159649 round to 1.1 gallons

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11y ago
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Q: How many gallons in a 3 inch by 36 inch tube?
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