This is what I did whem I got rid of the corragated(sp?). I just took the piece I was going to be connecting the new hose to Home Depot. Then I was able to try all the sizes at one time.
What you do have to look out for on hoses at Home Depot, Lowes, etc... is that the hose might be say 5/8", but you have to take in consideration the gage of the tube. Some tubing uses a thicker plastic than others.