The Rhino Mini Coffee Waste Bin is the perfect coffee knock-tube for home use. It has a small footprint alongside your coffee machine, with it's compact design.
This knock tube makes for clean and convenient coffee making; once you've finished making your coffee, simply knock the portafilter firmly on the knock bar, and your used coffee grounds will fall into the bin.
Best of all, it's dishwasher safe! (Just remove the rubber bar first!)