Sauce pump

Delivers a repeatable volume of a thick product on each full stroke, which is what turns a chocolate or caramel line from a habit into a costed, repeatable recipe.

A piston, a chamber and two one-way valves on a dip tube. The down-stroke pushes the chamber's contents out through the outlet valve; the up-stroke draws replacement product up the tube through the inlet valve. The delivered volume is the chamber's displacement, which means it is fixed by the pump and by nothing the barista can decide — except one thing: whether the stroke was completed. A half stroke delivers an unknown fraction and there is no way to see that it happened. Viscosity is the whole reason a sauce pump is a different object from a syrup pump. A thick product resists being drawn up the tube, so a sauce pump uses a wider bore and a longer stroke, and it needs more time between strokes for the chamber to refill; worked fast during a rush it refills partially and under-delivers, silently, in exactly the hour the recipe is least likely to be checked. Cold thickens the product further and slows the refill again, which is why the same pump on the same product behaves differently on a cold morning and at the end of a hot afternoon. The figure below is what the owner measured on the venue's own pumps at 15 ml per full stroke — and the way it was measured is the reason it can be trusted: ten strokes into a graduated cylinder, divided by ten. Ten and not one, because a single stroke's error — a short pull, a partial refill, a bottle running low — is the whole reading, while across ten strokes it is a tenth of it. That is the difference between a number you can reproduce when a pump wears or is replaced and a number that was true once.

A sauce pump and a syrup pump are two different pieces of equipment and they are not interchangeable, whatever the shelf they share. At the measured figures in the specs below — 15 ml for the sauce pump against 10 ml for the syrup pump — costing a sauce line at the syrup pump's volume understates it by a third, on every drink, forever. That error is invisible in the drink, invisible in the till and visible only in a margin nobody can explain.
Measure your own pumps before you cost anything with them, and measure them the way the figures below were produced: prime the pump, deliver ten full strokes into a graduated cylinder, and divide the total by ten. Ten strokes rather than one is the entire method — a single stroke's error is the whole reading, and across ten it is a tenth of it, which is what makes the number survive a pump being replaced with a different one.
Buy one pump per open bottle and leave it there for the life of the bottle. This is an allergen control before it is a flavour one: a pump moved from a nut-bearing sauce to another product carries residue on the outside of the dip tube into the next bottle, and no cleaning routine that happens at close will help a drink served at eleven in the morning.
Write recipes in strokes, never in squeezes, drizzles or spoons. A stroke is a unit the costing engine can hold, a trainee can be given on their first shift and a manager can audit from across the bar. Everything else is a description of an intention.
Re-measure after a pump is replaced, and treat a replacement as a new measurement rather than a like-for-like swap. Displacement varies between manufacturers and between production runs, and a bar that quietly fits a different pump to the same bottle has changed a recipe without changing the recipe.
Plan for the cold. A thick sauce in a cold room or on a cold morning draws slowly, and the stroke that the barista does not wait out is the stroke that under-delivers. If sauces are stored cold, the recipe needs either a temper step or an acceptance that the first drinks of the day are lighter than the rest.
Inspect for wear rather than waiting for failure. A pump whose seals have hardened delivers less on the same stroke, and the drink gets weaker over months with nobody able to name the day it changed — so a pump is a consumable, and re-measuring one that has been in service is how you find out it is finished.
Keep the pump with its bottle at close, and never in a communal sanitiser bucket where it will be picked up and fitted to whatever is nearest tomorrow. The discipline that makes the measurement worth having is the same discipline that keeps the allergen path closed.

At the build station, in the order the drinks are actually made, and grouped so the pumps that appear together in a recipe stand together on the shelf. The important part is not the shelf but the rule: the pump stays with its bottle, so the bottle's position in the line-up is also the pump's, and the allergen path is closed by the layout rather than by a reminder.

Costing a sauce line at a syrup pump's volume, or costing both at one generic "pump" that has no volume behind it at all.
Measuring a pump with a single stroke and treating the result as calibration.
Moving one pump between bottles to save buying a second, and calling it a cost saving rather than a removed allergen control.
Writing recipes in squeezes and drizzles, then trying to cost them afterwards.
Replacing a pump with whatever fits the thread and assuming the recipe still holds.
Pumping fast during a rush without letting a thick product refill the chamber.
Storing pumps loose in a communal bucket at close, so tomorrow's pairing is whatever comes to hand.

The bottle plus the stroke's vertical travel plus the hand above it. A sauce bottle under a low shelf is a bottle whose pump cannot be fully depressed, which converts every stroke into a partial one and every recipe into a guess.
Temperature changes viscosity and viscosity changes how the chamber refills. Storage temperature is therefore part of the recipe here, not a housekeeping detail — the same pump on the same product is a different pump cold.

Bottle-mounted piston pump
Screws onto the sauce bottle it serves and stays on it for the bottle's life.
The default and the right answer, because a pump that never leaves its bottle is a pump that never carries one product's allergen or flavour into another. It also means one pump per open bottle, which is a stocking decision that surprises operators who budgeted for one pump per product.
Bulk-container pump
A longer dip tube and a heavier body for a catering-size jar or pouch.
Fewer changeovers and less packaging, and a longer draw path that behaves differently as the container empties. The stroke volume is a property of the chamber, not the tube, but the effort and the refill time both climb as the level drops — which is where short strokes come from.
Squeeze bottle, no pump
The product is squeezed or poured, and the portion is judged by eye.
Fine for a decorative drizzle on top of a drink, where the amount is genuinely cosmetic, and indefensible for a recipe line. A squeezed portion cannot be costed, cannot be trained and cannot be audited, so anything squeezed is effectively an unmeasured ingredient in a priced drink.
One pump moved between bottles
A single pump lifted from one product and screwed onto another as needed.
Saves the cost of a second pump and creates a direct cross-contact path between products, including between an allergen-bearing sauce and one sold as free of it. Wet product on the outside of the dip tube goes into the next bottle. This is not a cost decision; it is a control that has been removed.

Drinks made during the rush taste lighter than the same drink made in a quiet period.
Strokes taken faster than the chamber can refill with a thick product, so each one delivers a partial charge.
Drink quality at peak and a recipe that is quietly wrong exactly when the most guests are being served. It is invisible because the stroke count was correct.
The sauce cost per drink drifts away from the costed figure across a season, with no price change from the supplier.
A pump replaced with a different one and never re-measured, or a worn pump under-delivering while the recipe still says the old figure.
Money, in both directions and both hidden: over-delivery is product walking out of the door, and under-delivery is a drink that is not the drink that was sold.
A product tastes faintly of a different sauce, or a guest reports a reaction to a drink that should not contain the allergen.
A pump moved between bottles, carrying residue on the outside of the dip tube.
A safety incident, not a quality one. This is the only failure on this page that can harm a person, and it is caused by a decision to own one fewer pump.
The pump feels heavier and the stream is thinner near the bottom of a bottle.
A long draw path through a nearly empty container, with the product cold and the tube partly in air.
Under-delivery on the last drinks from every bottle, which is a small error repeated at a predictable point — and therefore one of the few in this category that a written changeover level actually fixes.

Sauce pump

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