The only major drawback to pour spouts for liquor bottles, either free pourers or measured pourers, is that they leave the bottle open to contamination.  As a result, contaminants from dust to fruit flies can find their way into liquor and effectively ruin the bottle costing the bar potentially hundreds of dollars in lost revenue.  With these Coverall Pourer Covers and Shot Glass (case of 12) from Magnuson Industries, however, you can seal all of your liquor bottles with pour spouts on them.  These covers also double as a one ounce shot glass and are available in five colors: Red (390R), Clear (390C), Smoke (390S), Blue (390B) and Green (390G).