The coffee knock box in two lines
The stainless steel knock box is the container the spent puck goes into: 165mm across, 110mm tall, with the knock surfaces covered in rubber. It stands on its own on the counter and moves to wherever it is needed.
Who it is for
For anyone making coffee away from a fitted counter. Kiosks, stands, temporary setups, terraces: all the places where the built in grounds drawer does not exist, and without a knock box the puck ends up in the sink, which is the fastest way to block a drain. It works just as well at home, where it lets you pull four espressos in a row without walking to the bin between each one.
The rubber on the bar is the part that matters
Knocking out a puck is a sharp strike of the portafilter rim against a bar. If that bar is bare, the portafilter is what pays: the rim dents, the basket distorts and the seal against the group gasket gets worse, which shows up as side leaks during extraction. The rubber covering on this knock box takes the blow and leaves the expensive part alone. It is also the reason you never knock out on the edge of a bucket or on a sink: there is nothing there to absorb it.
Specifications
- Material: stainless steel with rubber covered parts
- Diameter: 165mm
- Height: 110mm
- Weight: 1.05kg
- Use: trade and home, free standing on the counter
Empty it and rinse it every day
Grounds are wet and oily, and coffee oils go rancid fast: a knock box left full from the evening to the morning gives back a sharp smell you can pick up from half a metre away, and it gets onto whoever works there. Emptying it is one of those jobs that sits at the bottom of the closing list and should be at the top, while the counter is still live and a rinse costs ten seconds.
Take the knock box if
If your counter has no grounds drawer, if you work temporary positions, if you travel to events and catering jobs with a lever or compact machine. A kilo of weight and 165mm across are the measurements of a piece that travels in a case with the rest without stealing space.
Grounds are not rubbish
They go in the food waste, and in a venue with a garden or pots they often go into the soil, where they work as a conditioner. It is worth knowing, because a coffee counter makes kilos of them every week, and because more and more guests ask where they end up.
The puck tells you how the shot went
Before you bin it, it is worth a look, and it is free. A compact puck that comes out whole and dry says the tamp was even; one that crumbles or has a crater in the middle says the water went through one side. Anyone who keeps the knock box to hand ends up doing this daily, and adjusts the grind before a guest notices.
FAQ
Does a knock box damage the portafilter? No, the knock surfaces are rubber covered for exactly that reason: it is the bare edge of a bucket that damages it.
What size is it? 165mm across by 110mm tall, and it weighs 1.05kg.
Is it suitable for home use? Yes, and it is how you pull several espressos in a row without emptying each time.
Can it be washed? It is stainless steel: rinse and dry, and do it daily, because coffee oils go rancid.
Does it stay put while you knock? The kilo of weight and the wide base give it stability on the counter.
The more you buy, the less you pay: 4 pieces -5%, 6 -7%, 8 -10%, on the same item.
Dispatched from Rome, Italy. 15-day returns, free of charge. Questions before you order? Message us on WhatsApp on +39 351 929 6937.
For the rest of the coffee counter there is the coffee accessories guide.
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