La Marzocco 6/8mm Conical Group Head Portafilter Gasket (H.3.001)
This gasket fits La Marzocco GS-2, GS-3, Linea, FB-70, GB-5 and FB-80. The thinnest version with a bevel, used on newer machines with no wear to moderate wear on the groups and portafilters. The "6" refers to the thickness on the outside diameter, the flat portion, and "8" refers to the thickness on the inside diameter, up to the peak of the cone shape. Installed correctly, with the cone sloped side facing down, the beveled edge of the cone shape adds an additional surface for a portafilter basket to seal against. La Marzocco old part #L105/B8, new part #H.3.001.