Free UK Delivery on orders over £75*
Brewing since 1974

Safety Cork for 1G or 5G Demijohn

Product ID: 184

The safety cork has a one-way valve to protect finished wine from spoilage when stored in 1gall. or 5gall. containe... read more

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Safety Cork for 1G & 5 G Demijohns

The safety cork has a one-way valve to protect finished wine from spoilage when stored in 1gall. or 5gall. containers.

A demijohn is a large glass container often used for fermenting and storing liquids such as wine, cider, or beer. It typically comes with a rubber or silicone bung that fits tightly into the mouth of the demijohn to prevent the contents from leaking or being exposed to air.

Demijohn safety cork is a bung / plastic stopper designed to release pressure in a container to prevent explosions or other dangerous situations. 

Safety corks are often used in the wine, champagne, and beer industries, where the carbon dioxide produced during fermentation can cause the bottle to become pressurized.

There are several types of safety stoopers, including those with a plastic or metal valve that will release pressure when it reaches a certain level or those with a weak point in the cork itself that will break under pressure. This demijohn safety corks is designed to be reusable, while others are intended for one-time use only.

Overall, the use of a container bung can help ensure that the contents of a bottle remain safe and free from the risk of explosion or other hazards

 Here are some tips for choosing and using a safety dung for home brewing:

  1. Use a high-quality bung that fits snugly in the fermenting vessel's opening. Make sure it is made of food-grade material and is the right size for your container.
  2. Choose a bung that has a pressure-release valve or a blow-off tube. This feature allows excess gas to escape, preventing the bung from popping out or the container from exploding.
  3. Clean and sanitize the bung before use. This will help prevent contamination and ensure that no harmful bacteria or other microorganisms can grow in your brew.
  4. Check the bung periodically during fermentation to ensure it is still secure and functioning correctly. If you notice any issues, such as the pressure-release valve not working correctly or the bung fitting too loosely, replace it immediately.
  5. Store your bung in a clean, dry place between uses. Avoid exposing it to extreme temperatures or sunlight, which can damage the material and reduce its effectiveness.

By following these suggestions, you can help ensure that your homebrewed beer or wine is safe to drink and free from any harmful contaminants.

Hold the container securely when handling a demijohn with a bung in place and avoid dropping or bumping it. Rough handling could cause the cork to dislodge or break, potentially resulting in spillage or injury. It is also a good idea to store the demijohn in a cool, dry place away from direct sunlight to help preserve the quality of the contents and reduce the risk of breakage or other damage.

Spend over £75 - Free Delivery to UK Mainland (Terms and Conditions Apply)

Spend Under £75 - Delivery charge £8 (Terms and Conditions Apply)

Typically Next Working Day (if ordered by 12:30 pm)

Our standard delivery applies to orders being shipped to the UK Mainland excluding Scottish Highlands. (See below for further details)

Collect From Brew Mart

Next Working Day (if ordered by 4 pm)

No minimum spend to collect from us. Use our address as the shipping address. 

Your order will be held for a minimum 7 days. 

If you wish to have this delivered the standard delivery charge will be applied.


Some orders we can dispatch in an envelope via Royal Mail. 

Where this is the case, we will endeavour to reduce your delivery charge accordingly. 

This reduction is done at our discretion, and we will inform you of this before dispatching your order.

Delivery Surcharges

All other UK areas: 

Delivery costs £20 per box. This applies to the following postal areas:

  • Northern Ireland
  • The Isle of Man
  • The Isle of Wight AB 37-56 FK19-21
  • G84
  • IV 1-56, IV63
  • KA27-28
  • KW1-17
  • PA20-39, 41-49, 60-78 PH14-50.
  • TR21-25 ZE1-3

In exceptional cases, we reserve the right to charge delivery at cost.

Our Highlands and Islands deliveries are sent via Royal Mail or Parcelforce and usually take 2-4 days from dispatch.

If you are in any doubt as to the delivery charge applicable to your order, please feel free to email us on before placing your order and we can confirm.


Any special instructions that can help the driver to deliver your order would be appreciated, e.g. 'deliver next door if out', 'knock loudly bell not working' etc.

There is a space to enter these instructions during the buying process.


If the instruction is such that a signature is not required, e.g. leave in conservatory around the back if out, then this can only be dispatched under the courier instruction "no signature required". In this case, the carrier will not accept any liability. That means should the consignment go missing or get damaged there will be no compensation.

If for any reason your package arrives with signs of damage please sign for the package as damaged.


We thoroughly check all items before despatch and endeavour to ensure that your order is perfect before it reaches you. In the unlikely event that something has gone wrong, or you've changed your mind we're here to help. If you have any issues with your order, we would recommend that you contact us on 01246 432581 or by email at


In the event of an item damaged in transit, you must notify us within 24 hours of receiving the goods, Providing photos of the;

1) consignment label on the external packaging.

2) damage to the external packaging 

3) internal packaging (the damaged goods.)

Failure to do so will result in your claim being refused.


If you find any of the items of your order missing, please contact us within 24 hours so that we can correct our mistake.


If you decide that you placed your order in error, you wish to cancel your order, or you have changed your mind you must notify us within seven days of receiving the goods.

Any items ordered may be returned to us at your expense within ten days from the date that you contacted us.

Please note: We are only able to refund the cost of the goods minus any postage we initially paid. If you return only part of the order, we will only refund the value of the goods returned.

We recommend that you use a tracked secure service for any returns as we cannot accept liability for loss or damage during any return transit.


We are unable to offer refunds on any item that has been made to order or personalised unless it is faulty. This is in accordance with UK law, and your statutory rights are not affected.

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