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A bottomless (or naked) portafilter has no spout — espresso flows directly from the filter basket into your cup. This lets you see your extraction in real time, making it easier to diagnose issues like channelling or uneven distribution. Most home baristas find it dramatically improves their technique and often their shot quality. If you're looking to take your espresso seriously, it's one of the best upgrades you can make.

Most Breville espresso machines (Barista Express, Barista Pro, Bambino, Bambino Plus, Dual Boiler) use a 54mm portafilter. The Breville Oracle uses a 58mm portafilter. If you're unsure, check the base of your existing portafilter — the diameter is usually stamped on the underside, or check your machine's manual.

54mm portafilters are the standard size for Breville/Sage home espresso machines. 58mm is the commercial standard, used in E61 machines, Gaggia Classic Pro, and higher-end home machines like the Breville Oracle. It's important to match your portafilter size exactly to your grouphead — the wrong size will not fit or seal properly.

In Australia, consumer guarantees under the Australian Consumer Law apply regardless of whether you use aftermarket accessories. Using an aftermarket portafilter that fits your machine correctly should not void your warranty for unrelated issues. Our portafilters are precision-engineered to fit correctly and are used by thousands of Breville owners without issue.

No — the Breville Barista Express has a 54mm grouphead and requires a 54mm portafilter. A 58mm portafilter will not fit and cannot be forced to fit without damaging your machine.