ZIRKUS Breville Dual Boiler/Oracle 58MM Bottomless Portafilter

The correct tamper/distributor should be selected according to the model of the coffee machine's portafilter.There are three main types of coffee machine portafilters on the market today, the first is the 51mm portafilter, the representative brand is Delonghi, Delonghi all models of coffee machines are using the The first is 51mm portafilter, the representative brand is Delonghi, all models of Delonghi coffee makers are using 51mm portafilter, if you don't need such precise tamper/distributor, you can also choose 49/49.5mm tamper.
The second type of coffee machine is the 54mm portafilter, the representative brand is Breville/Sage, its 5 series, 6 series, 7 series and 8 series models all use 54mm portafilter, actually the size of the portafilter basket is 53.7mm, so the Zirkus tamper is 53.3mm, so the Zirkus tamper is 53.3mm, so the Zirkus tamper is 53.3mm. mm for precise matching. It is worth noting that breville/sage's 9 series machines (920,980,990) use a 58mm portafilter, so you need to choose our 58.5mm tamper.
The third type of coffee maker is the one that uses 58mm portafilter, of which there are different portafilters such as E61 model, 3-ear portafilter, slanted 2-ear, etc. However, the actual size of their baskets is basically 58.7mm, so you can choose Zirkus 58.35mm/58.5mm tamper.
Besides that there are some niche coffee makers that use 45.5/49.0/53.0mm portafilter, just choose the size according to the original coffee maker.
You can also let us know your coffee maker model number via email (zirkuscoffee@gmail.com) and we will reply you with the right choice.

When selecting the appropriate portafilter or accessories for your espresso machine, it is essential to understand the dimensions and compatibility of the various sizes available. This guide provides a detailed sizing chart for 51mm, 54mm, and 58mm portafilters, which are the most commonly used sizes in the industry.

51mm

De'Longhi Dedica/SMEG 51mm (3 Ear Portafilter)

• De'Longhi Dedica (EC680, EC685, EC885)
• SMEG 50s Style Espresso Coffee Machine (ECF01, ECF02)
• EUPA (TSK-1837B, TSK-1819A)
  

De'Longhi La Specialista 51mm (i9 3 Ear Portafilter)

• La Specialista Opera, Arte, Maestro & Touch (EC9115, EC9155, EC9255, EC9335, EC9455M, EC9665, EC9865, EC9885)
• Dedica Maestro (EC900M, EC950M)

54mm

53mm Accessories are used with 54mm baskets/portafilters

Breville 54mm (3 Ear Portafilter)

• Breville Barista Express (BES870, BES875, BES876)
• Breville Barista Pro (BES878)
• Breville Barista Touch (BES880, BES881)
• Breville Infuser (BES840)
• Breville Bambino (BES450)
• Breville Bambino Plus (BES500)

58mm

E61 58mm (2 Ear Portafilter)

• All Machines using E61 Group Head
• Ascaso
• Gemilai (3-character models, 3005, 3035, 3211)
• ECM
• Lelit
• Rocket R58
• Sanremo
• Profitec
• Kaffa
• Faema
• EUPA (TSK-1858B,TSK-1899B)
• Expobar
• Vibiemme

Breville 58mm (Breville 9 Series 2 Ear Portafilter)

• Breville Dual Boiler (BES920)
• Breville The Oracle Series (BES980, BES985, BES990, BES995)

Gaggia

• Compatible with all 58mm Gaggia espresso machines

KitchenAid

• KitchenAid Semi Automatic Espresso Machine Series (KES6551)

Sunbeam

• Sunbeam Mini Barista (EM4300K)
  
• Sunbeam Barista Max (EM5300K)
  
• Sunbeam Barista Plus (EMM5400)
  
• Sunbeam Origins Series (EMM4500, EMM5500, EMM6500, EMM7300SS)

La Marzocco

• Linea Mini
• Linea Classic
• GS3
• Linea Micra 

A coffee tamper is an essential tool for crafting espresso, primarily used to compact coffee grounds into a uniform puck for optimal extraction. Its core functions can be summarized in three key aspects:

1. Adjusting Density: After dosing ground coffee into the portafilter, untamped grounds contain air pockets. The tamper applies vertical pressure (typically 30lbs/13.6kg) to eliminate voids, creating consistent density. This directly determines water flow rate - insufficient density causes fast channeling (under-extracted sourness), while excessive compression leads to choked flow (over-extracted bitterness).
2. Preventing Channeling: Uneven tamping creates low-resistance paths for water, causing localized over/under-extraction. Professional baristas often use self-leveling tampers with built-in pressure calibration and micro-articulation bases to achieve sub-millimeter flatness. Premium models feature ergonomic weight distribution (400-600g) and tapered edges matching exact portafilter dimensions (e.g., 58mm), eliminating edge gaps.

The threaded shape of the bottom can leave a threaded shape on the coffee powder, which is conducive to the extraction, the same time, the coffee powder has a larger contact area with the running water, so that the extraction occurs, you can retain a better coffee flavor.