



 
Hi Fred, The volume of a cylinder is given by
where r is the radius of the cylinder and h is the height(length). Your cylinder has a length of 12 350 = 4200 inches. Your tubing has a 3/8 inch inside diameter so the radius is 3/16 inches. Thus the volume is
Since you told us you are in the US I expect you want US gallons which are 128 fluid ounces not 64 fluid ounces. One US gallon is 231 cubic inches so your tubing has a volume of
Penny  


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