# IMS DS51 Puck Diffuser Screen > Espresso compatibility data from EspressoFit. Confidence: **manufacturer (Tier 1 — manufacturer primary source read firsthand)**. > Sources last read firsthand: 2026-08-10. > Canonical page: https://espressofit.com/parts/ims-ds51-puck-screen/ ## Specifications - **Part type:** Puck screen - **Size standard:** 51 mm - **Brand:** IMS ## Fits these machines - De'Longhi Dedica Maestro Plus (EC950M) (51mm portafilter) — https://espressofit.com/machines/delonghi-dedica-maestro-plus/ - La Pavoni Esperto Abile (52mm portafilter) — https://espressofit.com/machines/la-pavoni-esperto-abile/ - La Pavoni Europiccola Lusso (52mm portafilter) — https://espressofit.com/machines/la-pavoni-europiccola-lusso/ - La Pavoni Professional Lusso (52mm portafilter) — https://espressofit.com/machines/la-pavoni-professional-lusso/ - La Pavoni Stradivari Lusso (52mm portafilter) — https://espressofit.com/machines/la-pavoni-stradivari-lusso/ ## Notes A puck screen sits **on top** of the tamped coffee, under the shower screen. It spreads the arriving water across the whole bed rather than letting it drill in at one point, and it stops spent grounds being pulled up into the group at the end of the shot. IMS's **DS51** is built from an **AISI 301 photo-etched membrane** with a 150 µm filtering power, pierced by **199 holes of Ø2.4mm**. The photo-etching matters for the same reason it does on IMS's shower screens: it is one solid piece, so there are no layers for coffee oils to work into. ## One screen, two machine families This is the unusual case on this site of a single part that IMS names for two different manufacturers, and it is worth being precise about why. IMS specifies the DS51 by **tamper** compatibility — "Compatible with filter baskets for 51 mm tampers" — rather than by brand. It then names it explicitly on both of its brand pages: - **De'Longhi** — "For De'Longhi machines using 51mm filters, the correct puck screen is the 51mm model (our DS51)." - **La Pavoni** — "For Pre-Millennium groups, use our DS51 puck screen … For Post-Millennium, the DS51 is also the correct choice." So the cross-references below come from IMS naming each brand directly, not from us inferring that two similar numbers must be compatible. ## A note on La Pavoni's numbers La Pavoni's own machine pages state a "filter holder internal diameter (with filter)" of **52 mm**, while IMS describes post-millennium La Pavoni as taking "a 51mm basket and tamper". Both are correct and they describe different things — the holder measured with the basket in it versus the tamper that fits inside the basket. The same relationship is set out on the [La Pavoni lever tamper](/parts/la-pavoni-lever-tamper-51mm/) entry, and the general version of the trap is in [why 58mm isn't one standard](/guides/58mm-is-not-one-standard/). **Not covered here:** IMS notes the DS51 also fits pre-millennium La Pavoni's 49mm baskets. Vintage pre-millennium levers are a different format and are not in this database, so no pre-2000 machine is cross-referenced. On a lever machine specifically, IMS makes a point worth repeating: the screen "protects the shower screen from being sucked up during the lever lift" — the upward pull as you raise the lever is exactly when loose grounds migrate. ## Sources - https://imsfiltri.com/prodotto/puck-diffuser-screen-ds51/ - Official IMS Filtri product page ('DS51 PUCK SCREEN', Accessories / Puck Diffuser Screen), read firsthand 2026-08-10. Specs verbatim: 'SKU: DS51', 'Tamper Compatibility: 51 mm', 'Hole Dimension: Ø 2.4 mm', 'Number of Holes: 199', 'Filtration: 150 µm'. Described verbatim as 'studied to better distribute the water over the coffee pod, thanks to the new IMS technology that combines a hole area with a 150-micron filtering power photo-etched membrane', 'Constructed in combination with an AISI 301 photo-etched membrane boasting a filtering power of 150 microns', which 'guarantees an impeccably even water distribution over the coffee bed while preventing grounds from flowing back into the shower screen'. Compatibility stated as 'Compatible with filter baskets for 51 mm tampers'. - https://www.imsfiltri.com/la-pavoni-precision-filters-showers.html - Official IMS La Pavoni compatibility page, read firsthand 2026-08-10. FAQ item 03 states verbatim: 'Can I use a Puck Diffuser Screen with La Pavoni Europiccola? Yes! For Pre-Millennium groups, use our DS51 puck screen (which fits the 49mm baskets perfectly). For Post-Millennium, the DS51 is also the correct choice. Using a puck screen on a lever machine is highly effective: it protects the shower screen from being sucked up during the lever lift and ensures a flawless water dispersion.' The same page states verbatim that 'Post-Millennium machines (built after 2000) have a larger group head and require a 51mm basket and tamper.' - https://www.imsfiltri.com/delonghi-precision-filters-showers.html - Official IMS De'Longhi compatibility page, read firsthand 2026-08-10. States verbatim: 'Which Puck Diffuser should I use for De'Longhi?' — 'For De'Longhi machines using 51mm filters, the correct puck screen is the 51mm model (our DS51).' The same page states 'Most De'Longhi home machines, including the Dedica EC680/EC685 and EC885, use a 51mm group head.' --- Compatibility reference, not a substitute for your machine's manual. Every claim above cites the source it came from; see https://espressofit.com/methodology/ for how entries are verified. Corrections: corrections@espressofit.com.