Check your local hardware stores, if they don't have it they may be able to order it.
Copper Tubing Size, Outside Diameter controlled. - How copper and PEX tubing size is specified based on the outside diameter. Common sizes are 3/8, 1/2, and 3/4 inch. This contrasts to pipe sizing which is based on the inside diameter.
Yes OD never change
Try your hardware store.
Less than an inch.
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.
Assuming that the 14 inch box is square, you could fit a circle inside with a 14 inch diameter.
8 "
The inside diameter of the inner bull is 1/2 inch. The inside diameter of the outer bull is 1 1/4 inches.
The answer depends on what the "36 inch" measures: inside circumference, radius, diameter?
Assuming you are dealing with half inch id tubing it is 13.17 cubic cm per inch.
The diameter of the inside of the barrel in hundredths of an inch. A .45 caliber (check your spelling) fires a bullet 45/100ths of an inch in diameter.
diameters as small as one-eighth inch have been seen. When the inside diameter is less than about three-fourths of an inch, intermittent difficulty with swallowing can result.