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FIRSTENJOY 58mm Stainless Steel Bottomless Portafilter What is a bottomless portafilter and what is it used for? Bottomless portafilters are used as a training tool. It will provide you with immediate feedback and can see if channeling occurs right away. Channeling is the rapid passage of water through fractures in the coffee puck, which produces a thinner, under-extracted espresso. When it occurs, you'll often see sudden appearances of blond streaks in the stream of espresso; sometimes the puck will even have pencil lead-sized holes where channeling occurred. With this 58mm naked portafilter, you'll be able to see the extraction in real time to understand if you're grinding and tamping correctly. If you want to improve your barista skills by using a visual aid to identify what you're doing wrong, this is the perfect tool. Specification: Item Type: 58mm Bottomless Portafilter Material: 304 Stainless Steel + Wood Weight: 0.73lb Package includes: 1 x 58mm Bottomless Portafilter (BASKET NOT INCLUDED) Note: * Only compatible with the Breville BES900XL, BES920XL, BES980XL, BES990BSS Dual Boiler Espresso Machine.