La Marzocco OEM 6/8mm Conical Group Head Gasket The thinnest of La Marzocco's beveled conical group gaskets, for newer machines with no wear to moderate wear on the groups and portafilters. SPECIFICATIONS La Marzocco old part #: L105/B8; new part #: H.3.001 "6" = thickness at the outer diameter (flat portion); "8" = thickness at the inner diameter (peak of the cone) COMPATIBILITY Fits: La Marzocco GS-2, GS-3, Linea, FB-70, GB-5, FB-80 INSTALLATION Simple DIY replacement, no special tools required. PRO TIPS Install with the cone's sloped side facing down; the beveled edge gives the portafilter basket its sealing surface. Match the gasket to your wear level, start with this thinner 6/8mm version on newer, low-wear groups, and step up to the thicker 7/9mm version as wear increases.