I get asked this all the time, so I thought I would play around and tell you how to figure that out.
A 3/8" hose.
Remember Math class and saying "when will I ever need to know - πR² (Pi x Radius Squared)?" Well look at yourself now.
3/8" = .375" diameter. the radius is 1/2 of that. .1875
.1875 x .1875 x 3.14
Thats .110 cubic inches of space inside the 3/8" hose per inch of hose.
50' of hose is 600 inches.
600 x .110 = 66 cubic inches in a 50' hose.
1 gallon has 231 cubic inches.
If you have 200' of hose, you have 66 x 4 = 264 cubic inches. 1.14 gallons to fill the hose. (add a little for the fittings at each end of each hose)
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