Filling free flowing liquids through small openings can be a frustrating and messy process. These faucets are specially designed to work with bottle openings as small as 3/8 inch. This Faucet has 3/4 inch external NPT Thread and natural rubber gasket for attaching to a 3/4 inch drum bung opening. 100% FDA Compliant construction Polypropylene and polyethylene constructed faucet handles almost any non-flammable liquid. Half-turn on/off for quick, precise flow control.