Ace Seal is a global manufacturer of custom o-rings, seals, gaskets and other molded rubber & plastic components

Scotch Bung - Standard Bungs & Stoppers with 3/8 Thru Hole


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Standard silicone scotch barrel bungs with precision-molded 3/8” thru holes. These through holes are ideal for airlock devices/airlock functions and allow for the insertion of tubes or other implements, as needed. They also feature a special “top grip lip” that makes installation and removal easy and that extends past the sides of the opening for a more secure seal. Our thru hole barrel stoppers are manufactured from FDA grade/food grade silicone for safe and reliable sealing.


Contact us to discuss custom thru-hole scotch barrel stoppers for your application.

Price Each: From $0.000
Total Price: $4.25
Quantity 1-99 100-499 500-999 1000+ 
Price for each $4.250 $4.150 $4.000 Request a quote
Your savings - 2% 6% -
  • 55mm top x 44mm base x 48mm height

We offer through-hole scotch barrel bungs in stock U.S./French size (55mm top x 44mm base x 48mm height), and in custom sizes to meet your unique needs. Standard thru-hole bungs are “natural” color (translucent white) but can be manufactured in custom colors and/or with custom printing, as needed. 

Through Hole Scotch Barrel Stopper Features

  • Molded from FDA-approved food grade silicone
  • 3/8” through hole for airlock device
  • Available in stock U.S./French size or in custom sizes
  • Natural color is standard; custom colors available

We also offer solid scotch barrel bungs without top grip lip, hollow whiskey barrel bungs with or without top grip lip, and whiskey barrel bungs with 3/8” thru-holes.

What is Silicone & Why is It Used for Bungs?

“Silicone” is the general name for a large family of polymers, including any synthetic compound consisting of repeating units of siloxane. Silicone’s most common form, silicone rubber, is utilized in a broad range of applications. This material is non-reactive, stable, resistant to fungal growth, and is well-suited to use in harsh environments and extreme temperatures (-75° to 450°F/-60° to 232°C). Silicone rubber maintains its dimensional tolerances at high temps and doesn’t become brittle in subzero conditions.

Thanks to its beneficial chemical and mechanical properties, and the ease with which it can be manufactured and molded, silicon rubber is an ideal material for scotch barrel stoppers. Ace Seal uses special, FDA-approved food grade silicone for all our barrel bungs.

Ace Seal is Your #1 Source for High Quality Sealing Solutions

Ace Seal is a leading manufacturer of high-quality plastic and rubber sealing solutions for a variety of industry applications. Our exceptional customer service combined with our low-cost tooling and quick turnaround times make us a top choice for our customers around the globe. We maintain an extensive inventory of O-rings, gaskets, and other molded parts to satisfy the most demanding sealing requirements. We look forward to serving your sealing needs.

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