How to Change a Keg

Co-authored by Bryan Sullivan

Last Updated: May 1, 2024

Changing a keg of beer is a simple procedure but must be done systematically to reduce waste and ensure peak freshness and flavor. If you want to learn how to change a keg, follow these guidelines.

Method 1

Method 1 of 3:

Remove the Empty Keg

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You'll know that your keg is empty if you open the faucet of the tap and either very frothy beer comes out or none does.
Some kegs will have a CO2 tank that provides pressure inside the keg to help dispense beer. The gas also helps the beer hold its natural carbonation. If the system you're using has a CO2 line, turn it off.

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Grasp the coupler and rotate it counter-clockwise until it won't move anymore, usually just a half-turn.^{[1]
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Move the empty keg aside.
- You can use Powdered Brewery Wash or PBW to clean kegs at home.
- Mix hot water and PBW in the keg.
- Scrub with a sponge if needed, or let it sit overnight and rinse the next day.

Method 2

Method 2 of 3:

Connect the New Keg

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The cap will show the brand of the beer and its freshness date.
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Twist the tap a half-turn, in a clockwise direction, until it is snug.^{[4]
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If the beer doesn't flow, repeat the process.

Method 3

Method 3 of 3:

Replace the CO2 Canister

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The gauge should read 0. Other signs that you may need to replace your CO2 canister are that no beer flows from the faucet, or the beer is flat.
Use a spanner, or specialized wrench, to slowly disconnect the reducing valve from the cylinder to let the remaining gas escape. This will reduce the pressure inside the valve.
5
Install the new CO2 canister.
- Remove the protective tape from the replacement canister's outlet valve.
- Connect the new cylinder, tightening it with the spanner. Be sure to install a new plastic washer each time you change your gas canister.
- Turn the valve back on, twisting it counter-clockwise. Turn it until the hissing from the canister stops and the knob won't turn any further.
- Make sure the gauge shows pressurization.

Community Q&A

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Question

When I remove the coupler from the empty keg it sometimes loudly releases gas, even with the handle in the upright position. What am I doing wrong?

Community Answer

You have to lock the handle into the upright position. It should click and stop the gas. Turn off the gas from the pump would also be a good idea. If all else fails, its a faulty line and needs replacing.

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Tips

A CO2 cylinder will last for 7 to 10 kegs, depending on their size.

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If you're chilling your beer with ice, be sure to put some under the keg. The tap draws the beer from the bottom of the keg.

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Some kegs won't have a gas cylinder to help dispense beer. Instead, they will have a vertical pump. Pump once after you change a keg. If the beer doesn't flow or comes out flat, pump again until you achieve the desired result.

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Warnings

Kegs and CO2 canisters contain pressurized contents. Be careful when changing them.

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Taps aren't interchangeable with kegs of different beer brands. Make sure you replace an empty keg with the same brand.

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