A bottomless portafilter can help dial in the all the elements of pulling a great shot (grind, tamp, extraction time) by giving immediate feedback to the barista. Channeling of water caused by poor dosing and tamping can easily be spotted by little "spouts" erupting from the basket. Mottling or Tiger-Striping can easily be observed indicating a proper extraction. For more info and an excellent article on the use of a bottomless portafilter, read this article from Home-Barista.com.
This is a factory produced Rancilio Ergonomic bottomless portafilter, which means it is completely chrome plated. Many other bottomless portafilters on the market today are actually machined from an existing portafilter, which leaves an exposed ring of brass or other alloy without chrome plating.
This portafilter is compatible with all E-61 machines and Rancilio group heads (commercial and Silvia), and has the Double "R" Rancilio logo on the end of the handle.
-Rancilio Commercial Machines
-Rancilio Silvia : All Versions
-E61 Grouphead Machines including:
-Izzo Machines (Alex, Alex II, Alex II Duetto...)
-Quickmill Machines (Anita, Andreja Premium, Alexia, Silvano...)
-Expobar Machines (Brewtus, Office Lever, Office Pulser, Office Control...)
-Vibiemme (Super HX, Domobar Junior, DoubleDomo Super PID...)
-Wega (With E61 Grouphead)
-Rocket Espresso Machines (Giotto Evoluzione, Cellini Evoluzione, Giotto Premium Plus, Cellini Premium Plus...)
-Faema E61 Machines
-Isomac E61 Machines
-Grimac Machines (Grimac, Grimac Valentina)
A triple insert basket is included with this portafilter. You can easily swap it with your existing single or double basket if you desire.