> You need to know what size hose you are using first ( I think the #s refer to >1/16s of an inch... IE. 6AN would be 3/8" inside diameter.

One minor correction to an excellent treatise. AN hose is specified in "nominal" sizes that correlate to comparable copper tube sizes. -6 AN would be 3/8" but it's actual ID would be the same as the ID of a 3/8" tube size, or .340" instead of .375" which would be the OD of the tube.

Bob