The 20g size of VST’s precision basket line — the largest of the three sizes
(15/18/20g) that VST states fit most La Marzocco and Rancilio standard
portafilters, at 26.0mm depth per VST’s own size table. Note VST’s caveat
that some Rancilio portafilters may need a bottomless portafilter for sizes
above 18g. Does not fit 54mm machines. Verified against the official VST
store page on 2026-07-04. See the 15g and 18g entries for the smaller
variants.
FAQ
What size portafilter is the VST Precision 58mm Filter Basket (20g) for?
It is a 58mm basket, 26mm deep, for 58mm portafilters.
Is the VST Precision 58mm Filter Basket (20g) pressurized?
No — it is a non-pressurized (single-wall) basket, for freshly ground coffee.
Does the VST Precision 58mm Filter Basket (20g) 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 (20g) 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 20g basket at 26.0mm height. Available in standard (ridged) and ridgeless versions. 'VST Filters DO NOT fit 49, 53 or 54mm portafilters.'