Carboy Cap

Carboy Rubber Cap

A well fitting flexible carboy cap made of rubber with a hole in the centre to fit an airlock.

The universal carboy caps fits  the 1 gallon and 5 gallon sized glass demijohns or carboys / varboys and 5 gallon PET demijohns

A carboy cap is a type of closure used to seal a carboy, which is a large glass or plastic container typically used for storing liquids such as wine, beer, or chemicals.

A carboy cap typically has a centre hole through which a tube or other object can be inserted and may also have additional openings for airlocks or other accessories. The cap is designed to fit snugly over the mouth of the carboy to prevent spills, contamination, and evaporation.

Carboy caps are available in various materials, including rubber, silicone, and plastic, and are often sold as replacement parts for carboy fermentation systems or laboratory equipment. They can also be used in other applications where a large container needs a secure seal.