FastRack Drilled Rubber Stopper (#10-3 Pieces) | Solid Rubber Stopper Bungs for use with Fermentation Airlock | Durable Carboy Bung |Tapered Bung for Corking Home Brewing Glass Carboys

Description

Product Overview

FastRack’s #10 Rubber Stopper set is engineered for home brewers and laboratory enthusiasts who demand a reliable, airtight seal for their glass carboys and fermenters. Each of the three stoppers is crafted from BPA‑free, lab‑grade natural rubber that meets food‑safe standards, ensuring that no unwanted chemicals leach into your brew. The stoppers feature a precisely drilled 3/8″ center hole, matching the standard size of most fermentation airlocks, so you can install the airlock quickly without the need for additional adapters. The tapered, conical shape of each bung provides a snug fit that grips the mouth of the carboy securely, resisting slippage even when the fermenter is moved or when temperature fluctuations occur during the brewing process.

Dimensions for each stopper are 4.5 x 4.4 x 1.9 inches, and the set weighs a total of 6.4 ounces, making it lightweight yet robust enough to handle the pressures of active fermentation. The rubber material exhibits excellent heat resistance, allowing the stoppers to endure the warm environments typical of primary fermentation without degrading or losing elasticity. Additionally, the surface of the rubber is textured to enhance grip, reducing the chance of accidental removal while still being easy to clean and sanitize between uses.

Usage

These stoppers are ideal for a wide range of brewing applications, from small 1‑gallon homebrew batches to larger 5‑gallon carboy fermentations. Simply insert the tapered end of the stopper into the mouth of the carboy, ensuring the drilled hole aligns with the airlock opening. Once the stopper is seated, place the airlock into the hole; the airtight seal will prevent oxygen from entering the fermenter while allowing carbon dioxide to escape, which is essential for maintaining the desired flavor profile and preventing oxidation.

Beyond home brewing, the FastRack rubber stoppers are also suitable for laboratory settings where a secure, chemical‑resistant seal is required for glassware such as beakers, flasks, and storage bottles. Their BPA‑free composition makes them safe for a variety of chemical solutions, and the durable rubber can withstand repeated autoclaving cycles, extending the lifespan of the stoppers in demanding environments.

Whether you are a hobbyist brewer, a small‑scale craft beer producer, or a scientific researcher, the versatility of these stoppers ensures they meet the sealing needs of any glass container that requires a reliable, leak‑proof closure.

Why Choose Us

FastRack has built a reputation for delivering high‑quality lab and brewing accessories that combine durability with precision engineering. Our commitment to using BPA‑free, food‑grade natural rubber means you can trust that every stopper is safe for direct contact with consumable liquids. The manufacturing process includes rigorous quality control checks, ensuring each stopper meets exact dimensional tolerances for the 3/8″ airlock hole and the tapered profile.

We understand that a leaking fermenter can ruin an entire batch, which is why our stoppers are designed to stay in place even under the pressure of active fermentation. The textured surface not only improves grip during insertion but also helps prevent accidental dislodgement during transport or handling. In addition, the rubber material resists common brewing contaminants such as acids, alcohol, and residual sugars, reducing the risk of degradation over time.

Our after‑sales support is dedicated to ensuring your satisfaction. If you receive a damaged or incomplete set, our customer service team will promptly arrange a replacement or refund, reflecting our confidence in the product’s quality and our commitment to the brewing community.

Key Features

• Three BPA‑free, food‑safe rubber stoppers with a 3/8″ drilled hole for standard airlocks
• Tapered conical design provides a tight, slip‑resistant seal on glass carboys
• Heat‑resistant rubber endures fermentation temperatures without loss of elasticity
• Textured surface enhances grip for easy insertion and removal while maintaining airtight integrity
• FastRack customer support guarantees replacement or refund for damaged or incomplete orders

FAQ

What size airlock does the stopper accommodate?

The stopper is drilled with a 3/8″ (9.5 mm) center hole, which matches the standard size of most fermentation airlocks used in home brewing and laboratory applications.

Are the stoppers safe for food and beverage use?

Yes. FastRack uses BPA‑free, lab‑grade natural rubber that complies with food‑safe standards, ensuring no harmful chemicals leach into your brew or any consumable liquids.

Can the stoppers be autoclaved for laboratory sterilization?

Absolutely. The rubber material is designed to withstand high‑temperature autoclave cycles, making the stoppers reusable after proper cleaning and sterilization.

How does the tapered design improve performance?

The tapered shape creates a wedge effect that tightens the stopper as it is inserted, delivering a secure, airtight seal that resists slippage even when fermentation pressure builds or the container is moved.

What should I do if a stopper arrives damaged?

Contact FastRack customer service within 48 hours of receipt. We will arrange a prompt replacement or issue a refund, ensuring you receive a fully functional set for your brewing or lab needs.