That model name is an IMS product code — series, cup count, height and hole pattern are all encoded in it. IMS basket codes, decoded explains how to read one, and lists every code covered here.
The tallest of IMS’s B70 2-cup competition baskets — 26.5mm, two millimetres
deeper than the H24.5 and the one to reach for if you pull larger doses. IMS
rates it at 18–20g for a dark roast, rising to 22–24g for a light roast,
which makes it the natural choice for the light, high-dose recipes common in
competition and specialty cafés.
Otherwise it is the familiar B70 geometry: Ø70mm border, Ø60mm body, a 60.5mm
external ridge to seat securely in the portafilter, and 641 holes of 0.30mm in
IMS’s M pattern. Same official B70 compatibility as the rest of the series —
E61 and 58/58.4mm-tamper machines from La Marzocco, Rancilio, Lelit, Rocket, ECM
and the Breville Oracle. Gaggia machines take the narrower B68 series and are
deliberately not cross-referenced. Verified against IMS’s official product page
and Competition catalogue.
Other items confirmed to fit machines this one fits — useful if you're kitting out a single setup. The count is how many of those machines overlap; nothing here is a new fitment claim.
What size portafilter is the IMS B70 Competition 2 Cup H26.5 (B702TH26.5M) for?
It is a 58mm basket, 26.5mm deep, for 58mm portafilters.
Is the IMS B70 Competition 2 Cup H26.5 (B702TH26.5M) pressurized?
No — it is a non-pressurized (single-wall) basket, for freshly ground coffee.
Does the IMS B70 Competition 2 Cup H26.5 (B702TH26.5M) 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 IMS B70 Competition 2 Cup H26.5 (B702TH26.5M) fit?
Breville Oracle; ECM Estetika; ECM Mechanika MAX II; Flair 58; La Marzocco GS3; La Marzocco Linea Micra; La Marzocco Linea Mini; Lelit Bianca (PL162T); Lelit Elizabeth (PL92T); Lelit Kate (PL82T); Lelit MaraX (PL62X); Lelit Victoria (PL91T); Rancilio Silvia; Rancilio Silvia Pro; Rancilio Silvia Pro X; Rocket Espresso Appartamento; Rocket Espresso Epica; Rocket Espresso Giotto Fast; Rocket Espresso Mozzafiato Fast; Rocket Espresso Porta Via; Rocket Espresso R Nine One — each confirmed against manufacturer sources (listed below).
Sources
https://www.imsfiltri.com/filters/B702TH26.5M.html(archived) — Official IMS Filtri product page ('B70 2 Cups - H26.5 M Pattern'), read firsthand 2026-07-26. Specs verbatim: 'Border: Ø 70 mm', 'Body: Ø 60 mm', 'Height: 26.5 mm', tamper 'Ø 58/58.4 mm', ridge 'External Ø 60.5 mm', '641' holes of 'Ø 0.30 mm' in the 'M Pattern'. Capacity 18/20 gr (dark roast), 19/21 gr (medium), 22/24 gr (light). Amazon listing verified firsthand 2026-08-03: 'IMS Competition E-61 Precision Filter Ridged Basket 16/20 gr - B70 2T H26.5 M' — the listing spaces the code as 'B70 2T H26.5 M', i.e. B702TH26.5M, matching this entry. Add-to-cart present, i.e. actually buyable, at the time of checking.
https://www.imsfiltri.com/IMS-competition-Catalogue.pdf(archived) — Official IMS Competition Series catalogue, read firsthand 2026-07-04, whose 'For tamper 58 / 58.4' B70 compatibility list names La Marzocco, Rancilio, Lelit, Rocket, ECM and 'BREVILLE (The Oracle)' among the fitting brands — and 'FLAIR ESPRESSO (58)', which is why the Flair 58 is cross-referenced here; Gaggia is assigned to the narrower B68 series, so B70 baskets do not cross-reference Gaggia machines.