This high quality Silicone Stopper gives a great airtight seal while still allowing gasses to escape.
Fits 3,5,6 & 6.5 Gallon glass carboys and 500ml flasks. This breathable Silicone Carboy Stopper acts as both a solid stopper and an airlock. The unique design allows CO2 pressure to escape but keeps oxygen and airborne contamination out. Beer makers love using it during the ferment because it creates a vacuum when the wort cools, instead of pulling water in from your traditional airlock. The airtight seal is great for extended lager fermentations when CO2 production is still present but only very slightly.
Measures 1 1/2" wide at the top and 1 1/8" at the bottom.
FREE Shipping over $75
Flat Rate $7.95 under $75
- FREE Shipping on all orders over $75 shipping within the contiguous U.S.
- Most in-stock orders ship the following business day.
- Standard ground shipping typically takes 1-3 business days in transit
- please note: we are experiencing delays in some fulfillment centers due to COVID-19 and wildfires.
FedEx / UPS / USPS Shipping:
- FREE over $75*
- Flat rate $7.95 under $75
- 1-3 business days in transit
- Does not require Signature
We're committed to your total satisfaction. You may return your items within 30 days of their delivery. Please follow the instructions below.
- Returns must be in brand new condition.
- Items must be returned in their original packaging.
- Items must include all parts, pieces, and manuals.
- Items cannot be assembled or used in anyway.
Restocking fees are typically not applied, however, in some cases a restocking fee not to exceed 30% will be withheld from your returned merchandise total. Shipping costs are non-refundable.
If you have any further questions, please do not hesitate to contact us!
* Free Shipping only applies to orders over $75.00, shipping within the contiguous United States.