Choosing the Right Knock Box
The right knock box depends on how much space you have, how many shots you pull, and whether you're setting up a home bar or a commercial espresso station.
Rhino Coffee Gear Mini Knock Box (£19.99)
The most compact option in the range — designed for home espresso setups where counter space is limited. Small enough to sit neatly alongside a domestic espresso machine without dominating the worktop, with a rubber-coated knock bar and a removable inner bucket for easy emptying. The right starting point for anyone pulling one to four shots a day at home.
Rhino Coffee Gear Knock Box (£29.99)
A full-size countertop knock box with a larger capacity than the Mini — better suited to households pulling multiple shots throughout the day, or anyone who wants to empty less frequently. Sturdy construction, rubber knock bar, and a stable base that doesn't shift under impact. The most popular all-round choice for home baristas.
Rhino Coffee Gear Deluxe Stainless Steel Knock Box (£49.99)
A premium countertop knock box in brushed stainless steel — more durable, better looking, and more at home on a well-equipped espresso bar. The stainless body resists staining and odour absorption far better than plastic alternatives, and the weighted base keeps it planted firmly during use. A long-term investment for anyone who takes their home setup seriously.
Knock Chutes — Bar-Mount & Integrated Options
Knock chutes sit flush with or mount to a counter edge, with an open top that feeds used pucks directly into a bin or collection vessel below. They suit café setups where under-counter waste management is preferred, or home bars where a cleaner integrated look is the goal.
Rhino Coffee Gear Square Knock Chute (£54.99)
A square-profile knock chute designed to sit on the counter edge or mount to a custom bar setup, feeding pucks into a bin beneath. The knock bar sits at the optimal height for a natural knocking motion, and the rubber bar cover protects the portafilter while absorbing the impact sound. Widely used in café bar builds and home espresso stations with under-counter waste setups.
Rhino Coffee Gear Circular Knock Chute (£64.99)
The round-profile version of the knock chute — same function, different aesthetic. Suits circular or oval counter cutouts and certain bar design styles where a square profile doesn't fit. The rubber bar cover is replaceable independently when worn.
The Thumpa Range — Commercial Floor-Standing
The Rhino Thumpa range is designed for high-volume café environments where a countertop knock box isn't practical. Both models feed used pucks into a large-capacity floor-standing tube, keeping the counter clear and reducing the frequency of emptying.
Rhino Coffee Gear Thumpa Bench Knock Tube (£79.99)
A bench-mounted Thumpa unit — the knock mechanism sits on the counter and feeds down into a floor-standing collection tube via a chute. Designed for busy café bars where counter real estate is managed carefully and puck disposal needs to be fast and consistent. Compatible with Rhino Thumpa Bin Liners for hygienic, quick-change disposal.
Rhino Coffee Gear Thumpa Floor Standing Knock Tube (£79.99)
A fully floor-standing knock tube — the portafilter is knocked directly against a bar at counter height, and the puck drops straight down into the floor-standing collection tube below. No counter space required at all. The most space-efficient commercial option, and the preferred choice for high-volume multi-group setups. Thumpa Bin Liners make emptying quick and clean.
Rhino Thumpa Bin Liner — Pack of 100 (£59.99)
Dedicated bin liners for the Thumpa floor-standing and bench knock tubes. Using liners means the collection tube never needs rinsing out — simply lift, tie and dispose. At 100 per pack, they represent good value for a busy café environment. Not compatible with the standard countertop knock boxes.
Spare Parts & Accessories
Knock bars, rubber covers and gaskets take the impact so your portafilter doesn't have to — but they do wear over time, especially in a high-volume environment. Replacing worn parts is far more economical than replacing the whole unit, and Rhino stocks spares for every model in the range.
- Rhino Square Knock Chute Spare Rubber Bar Cover (£9.99) — replacement rubber sleeve for the Square Knock Chute bar. Replace when the rubber shows cracking or flattening.
- Rhino Round Knock Chute Spare Rubber Bar Cover (£9.99) — as above, for the Circular Knock Chute.
- Rhino Hush Gasket for Knock Chute (£9.99) — a noise-dampening gasket that reduces the impact sound when knocking the portafilter. Useful in quieter environments or open-plan kitchens.
- Rhino Spare Bar for Deluxe Knock Box (£9.99) — replacement knock bar for the Deluxe Stainless Steel Knock Box.
- Rhino Spare Bar for Domestic Waste Bin (£9.99) — replacement knock bar for the standard Rhino Knock Box.
- Rhino Bottom Gasket for Deluxe Knock Box (£9.99) — replacement base gasket to restore the non-slip footing on the Deluxe model.
- Rhino Top Gasket for Deluxe Knock Box (£9.99) — replacement top rim gasket for the Deluxe model.
- Rhino Coffee Gear Thumpa Replacement Set (£29.99) — a complete spare parts kit for the Thumpa range, including the knock bar and gaskets, so you can restore a worn Thumpa unit to full working condition without replacing it.
For a complete espresso prep station, our barista tools collection also covers tampers and mats, milk pitchers, thermometers and pitcher rinsers.
Frequently Asked Questions
What is a knock box and why do I need one?
A knock box — also called a coffee waste bin or espresso knock bin — is a container with a padded bar across the top. After pulling a shot of espresso, the used coffee grounds stay compressed in the portafilter basket as a solid puck. Knocking the portafilter firmly against the padded bar ejects the puck cleanly into the bin below. Without a knock box, most people end up tapping the portafilter against the edge of a bin or sink, which risks damaging the portafilter, making a mess, and slowing down workflow. A knock box keeps everything contained, protects your equipment, and makes puck disposal a one-second task rather than an interruption.
What size knock box do I need for home use?
For a typical home espresso setup pulling one to four shots at a time, the Rhino Mini Knock Box or standard Rhino Knock Box are both well suited. The Mini is the better choice if counter space is tight; the standard model is preferable if you're brewing for two or making multiple drinks in a session before emptying. For a more premium finish that matches a higher-spec machine and grinder, the Deluxe Stainless Steel Knock Box is worth the step up. The Thumpa range and knock chutes are primarily designed for café environments and custom bar builds rather than domestic countertops.
What is the difference between a knock box and a knock chute?
A knock box is a self-contained unit — the bar and the collection container are one piece that sits on the counter. A knock chute is a bar-and-frame assembly that mounts to the counter edge or a custom bar build, feeding used pucks into a separate bin positioned underneath or below the counter. Knock chutes are typically used in café environments where under-counter waste management is preferred, or in bespoke home bar builds where an integrated, flush-mounted look is desired. For most home setups, a knock box is simpler, more portable, and easier to empty.
How often should I empty my knock box?
Used espresso grounds are wet and will start to develop mould if left for several days, particularly in a warm kitchen environment. For home use, emptying every one to two days is a reasonable habit. For café use, frequency depends on volume — a busy bar might empty multiple times per shift. Used coffee grounds compost extremely well and are a useful addition to garden compost, or they can go into a food waste bin. If your knock box develops an odour, wash it out with warm soapy water and allow it to dry fully before reuse.
Why does the knock bar have a rubber cover?
The rubber sleeve on the knock bar serves two purposes: it cushions the impact to protect the portafilter handle and spout from cracking or chipping, and it absorbs some of the noise generated by knocking. Over time — particularly in high-volume café use — the rubber becomes compressed, cracked or smooth, reducing both its protective and noise-dampening effectiveness. Replacing the rubber bar cover is inexpensive and straightforward; Rhino sells replacement covers for all models in the range. It's worth inspecting the bar cover every few months if you're using your knock box daily.
Can I compost used espresso grounds?
Yes — spent espresso grounds are an excellent compost ingredient. They're rich in nitrogen and organic matter, and decompose quickly when mixed with carbon-rich materials like cardboard or dried leaves. They can also be dug directly into garden soil as a slow-release fertiliser, particularly around acid-loving plants. If you don't have a garden, many local councils accept coffee grounds in food waste collections. A knock box makes it easy to collect grounds cleanly for composting without mess — simply empty the bin directly into your compost caddy.
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