Where does the beer washer go?

http://images.search.yahoo.com/images/v ... gERVCcZqtY does it go in between the nut and the tailpiece or does it go nut tailpiece then beer washer? Thanks guys

After looking at it more I’m thinking its nut, tailpiece, then washer so that the washer is on touching the beer shank. It fits much better.

Your right that way it isn’t metal to metal which would leak.