Product review (1 stars): Incorrect item description
The description says 1/2" id.  That is inside diameter.  That includes the metal nut connection to the hose, to my knowledge.  I bought a pair before, but I forgot where.  The outside diameter of that hose was about 3/4" and the metal connection was clearly more than 3/8.  This one is 1/4" at the nut, and inside does not look 1/2".  If you want quicker filling machine, this is not the hose.