The 15g size of VST’s precision basket line — the smallest of the three sizes
(15/18/20g) that VST states fit most La Marzocco and Rancilio standard
portafilters, at 22.0mm depth per VST’s own size table. Like all VST sizes,
it does not fit 54mm machines such as the Brevilles. Verified against the
official VST store page on 2026-07-04. See the 18g entry for the mid-size
variant.
FAQ
What size portafilter is the VST Precision 58mm Filter Basket (15g) for?
It is a 58mm basket, 22mm deep, for 58mm portafilters.
Is the VST Precision 58mm Filter Basket (15g) pressurized?
No — it is a non-pressurized (single-wall) basket, for freshly ground coffee.
Does the VST Precision 58mm Filter Basket (15g) fit 54mm machines like the Breville Barista Express?
No. It is a 58mm basket, so it does not fit Breville's 54mm machines or any 54mm portafilter.
Which machines does the VST Precision 58mm Filter Basket (15g) fit?
La Marzocco GS3; La Marzocco Linea Micra; La Marzocco Linea Mini; Rancilio Silvia; Rancilio Silvia Pro; Rancilio Silvia Pro X — each confirmed against manufacturer sources (listed below).
Sources
https://store.vstapps.com/products/vst-precision-filter-baskets(archived) — Official VST store product page, read firsthand 2026-07-04. States verbatim: 'Designed to fit most 58mm Portafilters (inside diameter)' and '20g, 18g & 15g fits most La Marzocco, Synesso, Nuova Simonelli, Faema, La Cimbali, Rancilio'. The page's per-size table lists the 15g basket at 22.0mm height. Available in standard (ridged) and ridgeless versions. 'VST Filters DO NOT fit 49, 53 or 54mm portafilters.'