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5 x 2 piece handy airlocks made of durable clear plastic construction, complete with built in dust covers 5 x rubber plugs drilled with hole that fits an airlock Standard size and reusable Airlock fits into the borehole in the piling head 5 quiet handy airlocks and 5 rubber stoppers in each pack.; Product description If you are looking for quality accessories for home brewing or fermenting in mason jar lids, our handy airlocks and rubber stoppers are the perfect choice. This set includes five handy airlocks and five rubber stoppers that give you everything you need to properly ferment your favorite drinks. Our handy airlocks feature a durable, 2-piece, transparent plastic construction that allows you to easily observe the fermentation process. Handy airlocks are quieter than bubbler airlocks, they are virtually silent when air is released. They are designed to fit snugly into the rubber stopper when they fit in a glass bowl. This creates an airtight seal that helps prevent contamination and oxidation while allowing excess gas to escape through the airlock. The rubber plugs are standard size and reusable. They have a drilled hole for an airlock and are suitable for use with 5L glass half underpants. Plug size (approx. ): Height 32 mm, Diameter (top) 30 mm, Diameter (base) 27 mm. Simply add water to the airlocks and see bubbles as your beer, wine or cider ferments. The airlocks are reusable and also fit into drilled cork plugs or in a spout when installed in a fermentation bucket. With this set of 5 handy airlocks and 5 rubber stoppers, you can start multiple fermentation projects at the same time or replace old or damaged airlocks and plugs in your existing fermentation equipment. Whether you're an experienced fermenter or just starting out, our airlocks and grommets are the perfect choice.; Product description If you are looking for quality accessories for home brewing or fermenting in mason jar lids, our handy airlocks and rubber stoppers are the perfect choice. This set includes five handy airlocks and five rubber stoppers that give you everything you need to properly ferment your favorite drinks. Our handy airlocks feature a durable, 2-piece, transparent plastic construction that allows you to easily observe the fermentation process. Handy airlocks are quieter than bubbler airlocks, they are virtually silent when air is released. They are designed to fit snugly into the rubber stopper when they fit in a glass bowl. This creates an airtight seal that helps prevent contamination and oxidation while allowing excess gas to escape through the airlock. The rubber plugs are standard size and reusable. They have a drilled hole for an airlock and are suitable for use with 5L glass half underpants. Plug size (approx. ): Height 32 mm, Diameter (top) 30 mm, Diameter (base) 27 mm. Simply add water to the airlocks and see bubbles as your beer, wine or cider ferments. The airlocks are reusable and also fit into drilled cork plugs or in a spout when installed in a fermentation bucket. With this set of 5 handy airlocks and 5 rubber stoppers, you can start multiple fermentation projects at the same time or replace old or damaged airlocks and plugs in your existing fermentation equipment. Whether you're an experienced fermenter or just starting out, our airlocks and grommets are the perfect choice.; If you are looking for quality accessories for home brewing or fermenting in mason jar lids, our handy airlocks and rubber stoppers are the perfect choice. This set includes five handy airlocks and five rubber stoppers that give you everything you need to properly ferment your favorite drinks. Our handy airlocks feature a durable, 2-piece, transparent plastic construction that allows you to easily observe the fermentation process. Handy airlocks are quieter than bubbler airlocks, they are virtually silent when air is released. They are designed to fit snugly into the rubber stopper when they fit in a glass bowl. This creates an airtight seal that helps prevent contamination and oxidation while allowing excess gas to escape through the airlock. The rubber plugs are standard size and reusable. They have a drilled hole for an airlock and are suitable for use with 5L glass half underpants. Plug size (approx. ): Height 32 mm, Diameter (top) 30 mm, Diameter (base) 27 mm. Simply add water to the airlocks and see bubbles as your beer, wine or cider ferments. The airlocks are reusable and also fit into drilled cork plugs or in a spout when installed in a fermentation bucket. With this set of 5 handy airlocks and 5 rubber stoppers, you can start multiple fermentation projects at the same time or replace old or damaged airlocks and plugs in your existing fermentation equipment. Whether you're an experienced fermenter or just starting out, our airlocks and grommets are the perfect choice.