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Three-quarter inch diameter pipe refers to the outside diameter.

Different pipe types of the same outside diameter usually have different inside diameters.

ASTM SCH 40 pipe of 3/4 inch diameter has an inside diameter of 0.824 inches. ASTM CL 200 pipe of 3/4 inch diameter has an inside diameter of 0.930 inches because of the thinner wall.

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13y ago

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