La Marzocco 7/9 mm Conical Group Head Gasket
This gasket fits La Marzocco GS-2, GS-3, Linea, FB-70, GB-5 and FB-80. The thickest version with a bevel, used on older machines with extensive wear on the groups and portafilters. The "7" refers to the thickness on the outside diameter, the flat portion, and "9" 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/B9, new part #H.3.002.
Not too sure I like the conical gaskets! They definitely seal....but there is no "wiggle" room. I like the feel of new gaskets "squishing" when the portafilters go on....these are very tight and don't allow you to tighten the portafilter. If you like the feel of stiff fitting portafilters, you will love these. I will go back to flat gaskets when these wear out.