
Barrel bungs come in a variety of materials, including stainless steel and plastic. These materials provide durability and resistance to corrosion.
Stainless steel bungs are a popular choice for their strength and resistance to chemical corrosion. They're often used in applications where a high level of durability is required.
The size of the bung is also an important consideration. Bungs can range in size from 1/4 inch to 2 inches in diameter.
Product Options
Our barrel bungs come in a variety of materials, including FDA-approved food-grade silicone and rubber.
You can choose from standard sizes or custom sizes and colors to meet your specific needs.
Ace Seal's wine barrel stoppers are made from 100% FDA grade silicone for premium sealing capabilities and durability.
The standard size of our rubber wine stoppers is 55mm top x 45mm base x 43mm height, with a natural color.
We also offer custom sizes and colors for specialized applications, so don't hesitate to contact us to discuss your requirements.

Our silicone barrel bungs are available in standard and custom sizes, making them perfect for whiskey and scotch barrels of all sizes.
Made from high-quality, food-grade materials, our barrel stoppers are the perfect solution for distilleries, wineries, and breweries.
We use only the best materials to ensure our barrel bungs are durable and long-lasting.
You can choose from different wood species for your wooden barrel bung, giving you a range of options to suit your needs.
Our barrel bungs are designed to meet your sealing needs, whether you're working with wine barrels, whiskey barrels, or something else.
Types of Barrel Bungs
Barrel bungs come in various types to suit different needs. The most common types are wood, plastic, and metal bungs.
A wood bung is a traditional choice, often made from oak or other hardwoods. It's a popular option for whiskey barrels due to its natural flavor and aroma.
Plastic bungs, on the other hand, are a more modern alternative, often made from food-grade materials. They're a good choice for breweries and wineries that require a quick and easy solution.
Metal bungs, typically made from stainless steel or aluminum, offer a durable and long-lasting option. They're often used in commercial barrel production.
Types of Barrel Bungs

There are various types of barrel bungs available, each serving a specific purpose.
Ace Seal offers FDA approved food-grade silicone wine barrel bungs in multiple styles to meet your sealing needs.
You can choose from standard size bungs, which measure 55mm top x 45mm base x 43mm height, and come in a "natural" color.
Custom sizes and colors are also available for specialized applications, so don't hesitate to contact Ace Seal to discuss your specific requirements.
Rubber wine stopper options are also available, offering a reliable and effective way to seal your barrels.
Standard Tapered
A standard tapered bung is a type of stopper used to seal the openings of barrels, designed with a five-degree taper to match the taper of the bung hole for a snug fit.
The taper is a crucial feature of a standard tapered bung, allowing it to fit securely into the barrel and prevent leaks or spills.
Most barrels have a standard 5-degree taper, which makes a standard tapered bung a popular choice for sealing barrel openings.

The diameter of a standard tapered bung should match the hole in the barrel, with a diameter tolerance of +0.020" / -0.000".
The most popular diameter for a standard tapered bung is 2", and it can be produced in sizes ranging from 1” to 10” in diameter.
A standard tapered bung is typically ¾" thick, but can be made thicker to accommodate larger barrels or for added convenience.
The thickness of a standard tapered bung can range from ¾" to 1-7/16", with the most popular thickness being 7/8".
Straight Side with Chamfer
The Straight Side with Chamfer is a type of barrel bung that's specifically designed for head-filled barrels. Typically, they're 2-¼" in diameter.
This design allows for easy insertion of the bung into the container's opening while still providing a secure seal. It's often used in applications where barrels are palletized and stored upright, like in concrete warehouses.
A straight side gives full contact to the staves, which is beneficial for head-filled barrels that have a straight-sided hold. This is in contrast to traditional side-filled barrels that have a taper hole.
The chamfered edge on the bottom of the bung makes it easy to insert, making it a practical choice for many applications.
Compressed

Compressed bungs are made from compressed poplar and are used to seal containers where a super tight seal is required.
They're particularly useful for beer barrels, where the carbonation inside the barrel pushes on the bung, and without a tight seal, the bung will pop out.
In recent years, compressed bungs have gained popularity for whiskey and spirit barrels as well.
Why Choose Silicone for Whiskey
Silicone is a popular choice for whiskey barrel bungs because it's non-reactive, meaning it won't impart any unwanted flavors or aromas to the whiskey.
Silicone bungs are also very flexible, which makes them easy to insert and remove from the barrel without causing damage.
They can withstand extreme temperatures, ranging from -40°C to 200°C, making them suitable for use in a variety of environments.
Silicone is also resistant to many chemicals, including ethanol and other solvents found in whiskey, which helps to prevent degradation or damage.
This makes silicone bungs a durable and long-lasting option for whiskey barrels.
Regular cleaning and maintenance of silicone bungs is a breeze, as they can be easily sanitized and disinfected.
Their smooth surface also prevents any bacterial growth, which can be a problem with other materials.
Product Information

A wooden barrel bung is a crucial component for sealing wooden barrels, and it's great to have options to choose from.
We have different types of bungs available, each with its own characteristics.
You can choose from various wood species for your barrel bung, giving you the flexibility to select the one that best suits your needs.
Barrel bungs come in a range of diameters to fit different barrel sizes, ensuring a secure fit.
Wooden Barrel Bungs
Wooden barrel bungs are a popular choice for many brewers and winemakers due to their affordability and ease of use. They can be made from various types of wood, including oak, maple, and cherry.
A typical wooden barrel bung is about 2-3 inches in diameter and 1-2 inches thick. This size allows for a snug fit in most barrels.
Wooden bungs can be prone to drying out and cracking, especially if they're not properly sealed. Regular maintenance, such as applying a food-grade wax or oil, can help prevent this issue.
Solid Top Grip Lip

Solid top grip lip barrel bungs are a game-changer for anyone working with wooden barrels. They feature a "top grip lip" for easier removal and a more reliable seal.
This design makes it simpler to take the bung out of the barrel without having to worry about it getting stuck or causing a mess. I've seen it happen to others, and it's not fun.
The top grip lip also creates a tighter seal, which is essential for preventing leaks and keeping the contents of the barrel fresh. It's a small detail, but it makes a big difference in the long run.
Some solid top grip lip barrel bungs are manufactured from FDA-approved food-grade silicone, which is a big plus if you're working with food or drink products. This ensures that the bung is safe to use and won't contaminate the contents of the barrel.
Here are some key features of solid top grip lip barrel bungs:
Overall, solid top grip lip barrel bungs are a great option for anyone working with wooden barrels. They're easy to use, reliable, and safe, making them a great choice for a variety of applications.
Solid Plug

Solid plugs are a great option for securing your wooden barrels. They're precision molded to fit all U.S. and French barrels, making them a versatile choice.
The FDA-approved food-grade material used to manufacture these plugs ensures they're safe for use in winemaking and other food-related applications.
For those who prefer a traditional solid plug, Ace Seal's option is a reliable choice. It's designed to provide a secure seal and easy removal, thanks to its top grip lip.
If you're looking for a more flexible option, you might consider a hollow plug. Cincinnati Dowel offers a hollow Scotch Barrel Bung with a top grip lip that's both lightweight and easy to use.
The center hole on this plug is 25.4mm wide and 35.5mm deep, making it suitable for a variety of applications.
A Serrated
A serrated bung is a premium option that's gaining popularity among distilleries and breweries. It features small serrations along the taper to provide a more secure and airtight seal.
This type of bung is designed to produce a better yield due to the ridges on the side that provide a better grip. A serrate bung is essentially a tapered bung with a twist.
A serrated bung is available from suppliers like Cincinnati Dowel, who offer a range of wood components, including bungs, that meet the highest standards for reliability and performance. Their products undergo stringent quality control measures to ensure they meet the highest standards.
The serrated bung is a great option for those looking for a more secure seal, but it's worth noting that it may be more challenging to remove than a standard bung.
What is Wood
Wood is a natural, renewable resource obtained from trees, primarily composed of cellulose and lignin, which give it strength and durability.
It's made up of about 50% cellulose, a type of carbohydrate, and 30% lignin, a complex organic compound.
Wood is a porous material, meaning it has tiny holes and gaps that allow it to absorb and release moisture.
This property makes it prone to warping and cracking if not properly maintained, especially when exposed to changing humidity levels.
Wood is also a popular choice for crafting wooden barrel bungs because it's relatively easy to shape and work with, thanks to its fibrous structure.
Wooden Species

White Oak bungs are gaining popularity for their aesthetic appeal and versatility, making them suitable for all barrel components.
Poplar bungs are the most cost-effective option and are made from soft poplar wood that can expand to create a tighter seal.
Walnut bungs are prized for their rich, dark color and attractive grain patterns, often used for sealing high-end spirits.
Poplar is a popular choice for barrel bungs because it's a softer wood that can expand and swell quickly to provide the right seal.
White Oak is also used for barrel components like barrels, spiles, and wedges, making it a versatile option.
Walnut bungs add a touch of elegance to the storage of high-end spirits.
Importance of Size
The size of barrel bungs is more important than you might think. Barrels come in all shapes and sizes, with some being metric and others in standard units.
In fact, some barrels can be reused for up to 100 years, and over time, the hole may be reamed, changing its diameter. This makes it essential to have a bung that can accommodate a wide range of sizes.
Why Is Size Important?

Size is crucial when it comes to bungs because barrels can be reused and their holes can change over time, affecting the fit of the bung.
The size of bungs needs to accommodate a wide range of sizes due to the reuse of barrels, some of which can be up to 100 years old.
Barrels come in different sizes, both metric and standard unit sizes, which can make it challenging to find a bung that fits.
Manufacturers can produce bungs with a 3/8” through-hole that provides an airlock function, allowing for the insertion of tubes or other implements.
The diameter tolerance of bungs is specs. +0.020" / -0.000", and they can be produced with diameters ranging from 1” to 10” with the most popular being 2”.
A thicker bung typically allows you to use one bung for multiple barrel sizes, such as a 2” and a 2-1/8” barrel.
The thickness of bungs can be made anywhere between ¾” and 1-7/16”, with the most popular being 7/8”.
Third-Quality

Third-Quality items are often unusable, and in some cases, are even burned as fuel to power the kiln or boiler.
These items have compromised structural integrity, which makes them unreliable for their intended purpose.
They can also be extremely over or under-sized, which affects their functionality and usability.
Major chunks missing from Third-Quality items render them useless for most applications.
In our facility, these items are utilized as fuel to heat our building and dry green lumber.
Customization and Quality
At Cincinnati Dowel, quality is paramount when it comes to their barrel bungs. They have a meticulous quality control process that ensures their products meet the highest standards.
The company uses a custom-built bung sorting machine that sorts standard 2” poplar and white oak bungs, as well as other less common and custom sizes that are still sorted by hand. This machine is equipped with three state-of-the-art triple imaging inspection cameras and lasers that can check for all dimensions and defects of a barrel bung.
Their quality control process involves a manual check of the diameter and angle of the taper on all bungs throughout the day, ensuring that the machines are calibrated correctly. This is done to identify and resolve any potential defects or machine issues.
Cincinnati Dowel offers different grades of bungs, including Premium First Quality Bungs that are free from defects and sorted for color and major indentations. They also offer Second-Quality Bungs that may have minor knots and other small imperfections, but are still a quality product.
These bungs are used in various applications, such as place holders in barrels, insulation plugs, and paper core plugs, where a watertight seal is not required.
Customization:
We supply bungs to countries all over the world. Our ability to produce metric sizes ensures an exact fit for our customers.
As a manufacturer, we have the flexibility to create customized bungs that meet specific needs. This includes laser engraving a company's logo onto the bungs.
These customized bungs are still of the highest quality, making them suitable for production use. They also serve as a unique promotional item for distilleries and other businesses.
Customers have used our customized bungs for a variety of purposes, including giveaways on tours, tastings, and even business cards.
Second-Quality

Second-quality bungs are a great option for projects where a watertight seal isn't necessary.
These bungs may have minor knots and other small imperfections, but they're still a quality product.
They're often used as placeholders in barrels, providing a stable base for whatever's inside.
You can also use them as insulation plugs, keeping things from shifting around.
Paper core plugs are another common use for second-quality bungs.
In fact, they're suitable for any instance that doesn't require a watertight seal.
Here are some specific examples of how second-quality bungs can be used:
- Place holders in barrels
- Insulation plugs
- Paper core plugs
- Any other instances that do not require a watertight seal
Quality and Certification
At Cincinnati Dowel, quality control measures are implemented to ensure high-quality bungs. They use thorough inspection processes and the latest technology to guarantee reliability and performance.
Stringent quality control is not just about meeting standards, but also about instilling confidence in customers that every product they purchase is top-notch.
Their attention to detail and commitment to excellence set them apart as a trusted supplier of top-notch bungs for various applications.
You can rely on Cincinnati Dowel to deliver bungs that exceed expectations and stand the test of time.
Shipping and Protection
We take the necessary precautions to protect our bungs during shipping to prevent any potential damage.
A plastic liner is used to keep moisture out, preventing the expansion or contraction of bungs which can compromise the quality of the product.
The liner serves as a barrier that shields the bungs from external elements that could potentially cause harm.
It acts as a protective layer along with a reinforced, side-seamed, corrugated box, minimizing the risk of any damage occurring during transit.
The liner allows you to receive your order of bungs in top condition, ready for immediate use.
Frequently Asked Questions
What are bungs used for?
Bungs, also known as rubber stoppers, are used to seal containers such as bottles and tubes from the outside. They're a simple yet effective solution for keeping contents secure in various applications.
What is a barrel stopper?
A barrel stopper, also known as a bung, is a device used to seal the opening of a barrel to keep it airtight. It's similar to a cork in a bottle, but specifically designed for barrels used in the wine industry.
Sources
- https://www.aceseal.com/wine-barrel-bungs
- https://www.aceseal.com/whiskey-barrel-bungs
- https://www.cincinnatidowel.com/blog/entry/product-spotlight-wooden-barrel-bungs/
- https://www.mysticbarrels.com/blogs/news/tips-for-barrel-bungs
- https://www.cincinnatidowel.com/blog/entry/quality-control-of-barrel-bungs/
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