Requires use of Swivel Seal, Auto-Fit, or Auto-Mate Hose Ends.
Army/Navy (AN) Sizing...
-3AN = 3/16" Hose
-4AN = 4/16" = 1/4" Hose
-6AN = 6/16" = 3/8" Hose
-8AN = 8/16" = 1/2" Hose
etc....
So you take your AN size and divide it by 16...this will give you your hose diameter in inches!