What Is a Pub Handpump? The Beer Engine Explained

What is a pub handpump?

A pub handpump is the tall lever on the bar that a server pulls to draw beer up from the cellar. The handle is only the visible part: it works a beer engine, a simple manual pump that lifts cask ale through a line and out of a spout into your glass, with no gas pushing it. The badge on the front, called a pump clip, tells you which beer that pump is pouring. The handle is also the most recognisable signal on a British bar, and signals can be borrowed.

What are the parts you can see from the bar?

From the customer's side of the counter, a handpump has four visible parts.

• The handle. The lever the server pulls towards them; the work it does happens out of sight.
• The pump clip. The badge fixed to the handle. The Wikipedia article on the beer engine describes pump clips as badges that show which cask ales are available, sometimes adding the brewer and strength, and notes they take their name from the clip that fastens them to the handle. Large breweries tend to use plastic, metal or ceramic clips; smaller brewers and one-off beers often use printed plastic or laminated paper.
• The spout or nozzle. Where the beer comes out. Some pumps have a swan neck, which Wikipedia defines simply as "a curved spout".
• The sparkler. An attachment that may be fitted to the end of the nozzle, which changes what lands in your glass.

What you cannot see is the line running down through the bar to the cellar, and the cask at the other end of it.

How does a beer engine work?

A beer engine is a piston pump. According to Dummies' guide to dispensing real ale, "The airtight piston chamber is at the heart of it all", with two one-way valves controlling the flow: one keeps beer in the chamber, the other lets it out towards the tap.

In practice the cycle runs like this:

1. The pull. The server draws the handle forward. Inside the engine, the piston moves and beer is drawn up the line from the cask into the chamber.
2. The one-way valve closes behind it, so the beer cannot slide back down to the cellar.
3. The beer leaves the chamber through the second valve and out of the spout into the glass.

The same Dummies guide notes that getting beer into the chamber in the first place may take several pulls, depending on how long the line is, and says "The typical beer engine can draw about half a pint of beer with each pull of the handle", so a skilled server fills a pint in about two full draws.

That half-pint figure is typical rather than universal. Angram, a manufacturer of hand pulls, says the internal cylinder of its traditional model "can be sized according to the pouring style", with capacities of 1/2, 1/3 or 1/4 pint, as shown on the Celli Group product page. Micro Matic lists a clamp-on beer engine at "1/4 pint per pull". So if you watch a server pull four times for one pint, nothing is wrong; that pump simply has a smaller cylinder.

Where is the beer engine actually located?

Usually under the counter. Wikipedia describes the beer engine as "a device for pumping beer from a cask, usually located in a pub's cellar", and adds that it is "normally located below the bar", with the handle used to draw beer through a flexible tube to the spout. Some modern pumps are mounted on the bar or clamped to its edge, like the clamp-on model above.

The cask sits in the cellar, so cellar temperature shapes what you drink upstairs. CAMRA's London Drinker, reporting the campaign's updated definitions, states that "The recommended cellar temperature is 11 to 14°C" (London Drinker). Cask Marque advises serving at "cellar temperature" of between 11 and 13ºC (Cask Marque). Some beer engines are water-jacketed to help: Micro Matic describes a water jacket that "recirculates water from a cool water source to cool the beer line and cool the dispense head".

Why does cask ale need a handpump at all?

Because cask ale is not pushed out by gas, as keg beer typically is. CAMRA defines cask-conditioned beer as "live beer that continues to mature and condition in its cask, any excess of carbon dioxide being vented such that it is served at atmospheric pressure" (London Drinker).

Beer at atmospheric pressure has no push of its own, so something has to lift it from the cellar. The beer engine is that something. Micro Matic puts it plainly: "Cask style beer is dispensed without using CO2 gas."

There are other ways to serve cask ale. The Dummies guide describes gravity dispense, where the cask is fitted with a tap and beer flows into the glass under its own weight; it notes that "Gravity dispense requires very little setup or take-down", which is why many beer festivals use it. Wikipedia also notes that "Electrically powered and gas powered pumps are occasionally used" in place of a hand-operated engine. So a handpump is the classic way to serve cask ale, not the only one.

What does a sparkler do, and why does it matter in the North?

A sparkler is, in Wikipedia's words, "a nozzle containing small holes", fitted to the end of the spout. The same article explains that it draws air into the beer through the venturi effect as it enters the glass, producing a head. It adds that "breweries in northern England serve their beers with a sparkler attached and breweries in the south without, but this is by no means definitive."

For anyone drinking in County Durham, that means a pint pulled through a swan neck and sparkler, with a dense head sitting proud of the rim, is a normal regional style and not a sign of anything amiss. Wikipedia records that critics say sparklers dull hop aroma and flavour, while supporters say they soften harshness. It also makes a less flattering point, that "A sparkler will disguise flat beer", because the aeration can supply a head the beer would not otherwise hold. A good head is pleasant; it is not, on its own, proof of a well-kept cask.

Does a handpump always mean cask ale?

Not necessarily. The handle has become shorthand for cask beer, but the hardware behind it can vary.

In April 2024, CAMRA wrote to national trading standards bodies about keg versions of three cask beers being served through handpumps. Its press release of 4 April 2024 quotes its letters as saying handpumps are "synonymous with cask beer" and that serving the keg product through them "constitutes misleading dispense". The letters cite a 1988 position from the Local Authority Co-ordinating Body on Trading Standards (LACOTS), which CAMRA says agreed "that the use of a handpump to serve keg beers was misleading." That is CAMRA's account of its own complaint; the release does not record a ruling.

Equipment makers also now sell handles that look traditional but work differently inside. Angram's cylinderless hand pulls use an internal gas spring mechanism to give the feel of a traditional pump, and the maker says they "allow pubs to serve cask beer to their customers using the existing draught system". For the drinker the point is simple: two handles that look identical from your side of the bar may not have the same thing behind them.

How can you tell what you are actually being served?

There is no foolproof test from the customer side, but in our view these help:

• Read the pump clip closely. Some clips state the style or say "cask" outright; some do not.
• Ask. "Is this one on cask?" is an ordinary question at a British bar, and staff who look after their cellar are usually glad to answer. Our guide to British pub etiquette covers how to ask without holding up the queue.
• Watch the pour. A beer engine needs a deliberate pull, often two or more for a pint, as described above. A pull that feels like a tap opening is a clue, though not a verdict.
• Taste and temperature. Cask ale served as intended sits at cellar temperature, with gentle carbonation. A sparkler can change the head, so judge the beer underneath it.

None of these settles the question on its own. Together, and with a friendly question across the bar, they usually do.

Where does the beer engine come from?

Wikipedia credits its invention to John Lofting, a Dutch inventor who "moved from Amsterdam to London in about 1688", and records that Joseph Bramah "developed beer pumping further in 1797." The principle remains a handle, a piston, two valves and a line to the cellar.

Planning a trip around the dales? Our round-up of things to do in County Durham pairs well with a pint at the end of the day, and our guide to British pub food classics covers what to eat alongside it. For more, browse the pub culture section.

Sources

• Wikipedia: Beer engine
• Dummies: Dispensing real ale
• Celli Group: Angram traditional hand pulls
• Celli Group: Angram cylinderless hand pulls
• Micro Matic: Clamp-on beer engine with water cooling
• London Drinker (CAMRA): CAMRA updates its definition of real ale
• Cask Marque: Why beer quality is important for cask ale
• CAMRA press release, 4 April 2024: CAMRA reports global brewer to national trading standards bodies