Bar Butler single-shot liquor dispenser. This type of dispenser is designed to be mounted on a wall or shelf and pours a measured shot of liquor.
It is also known as a "Bar Butler," "Tot Shot Liquor Dispenser," or "Wall Mounted Liquor Dispenser".
It features a spring-loaded receptacle to hold various bottle sizes.
The dispenser pours a pre-measured amount, such as 1.5 ounces (45 ml), to prevent over-pouring and spills.