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I'll assume you have Schedule 40 pipe. 2.5 inch has an ID of 2.469 inches, and an area of 4.7878 in^2. The volume of 69" of that (5.75 ft) is 330.4 in^3. One gallon is 231 in^3, so it will contain 1.430 gallons if full.

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14y ago

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