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1. Gas Bottle - in this case 30/70 Mixed Gas

2. Primary Reducing Valve (PRV)

3. Gas Gauge

5. Keg Coupler

4. Secondary Reducing Valve (SRV)

Keg Coupler

We have now added the Keg Coupler (7) to our drawing below. The green lines are gas pipes joining the gadgets together.

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The Keg Coupler

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Keg Coupler

The Keg Coupler is the gadget that connects onto our Keg - so it is pretty important!

The Keg Coupler has two jobs:-

1. Put gas into the Keg.

2. Let beer out of the Keg

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Unfortunately it is difficult to explain how the Keg Coupler works without looking at the Keg at the same time!

So on this page we will quickly cover off some things about the Keg Coupler on it’s own and then explain everything in the next section - The Keg.

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There are different versions of ‘Keg Coupler’ in use throughout the UK and the world.

Below are the versions of Keg Coupler used in the UK.


Molson Coors Brewing Company (Carling, Coors, Worthington's) use the ‘Grundy’ or ‘Tri-lobe’ ‘Keg Coupler’.

Heineken Brewing Company (John Smiths, Fosters) use the ‘Sankey’ style ‘Keg Coupler’.

Inbev Brewing Company (Stella, Boddingtons) use the ‘U’ style ‘Keg Coupler’.

Diageo (Guinness) use the ‘A’ style ‘Keg Coupler’.

I always show my customers the different versions of Keg Couplers during their cellar training / cellar management course.

All of these Keg Couplers do the exactly the same job - they are just different versions.

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Because we have to put gas back into our Keg and take beer out of our Keg, it is pretty reasonable to assume that this ‘Keg Coupler’ gadget will have 2 pipes attached to it and this is indeed the case - one pipe for the beer and one pipe for the gas.

The gas inlet pipe is always on the side of the ‘Keg Coupler’

The beer outlet pipe is always on top of the ‘Keg Coupler’

In the photographs below this can be clearly seen.

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3. A photograph showing the braided beer pipe at the top of the Grundy style ‘Keg Coupler’ and the grey gas pipe on the side of the Grundy style ‘Keg Coupler’

The golden colour of the beer pipe is actually the Carling lager inside it.

4. A photograph showing the clear beer pipe at the top of the ‘U’ style ‘Keg Coupler’ and the grey gas pipe on the side of the ‘U’ style ‘Keg Coupler’

The very pale golden colour of the beer pipe is actually the Stella lager inside it.

5. A photograph showing the clear beer pipe at the top of the Sankey style ‘Keg Coupler’ and the grey gas pipe on the side of the Sankey style ‘Keg Coupler’

The golden colour of the beer pipe is actually the Fosters lager inside it.

The Keg

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Keg Coupler supplier link

In the next section we will see the Keg and how it connects to the Keg Coupler.