La Pavoni Millennium Upper Group Sleeve This plastic sleeve adapts the slightly larger-diameter group that La Pavoni introduced in 2001 for better thermal performance - it keeps portafilter fitment correct on Millennium-era groups. COMPATIBILITY Fits: La Pavoni Millennium edition groups produced after the 2001 diameter change INSTALLATION DIY - fits per La Pavoni's factory design. PRO TIPS This sleeve exists specifically because La Pavoni increased group diameter by 2mm in 2001 for better heat retention - if your portafilter feels loose or won't lock in properly on a Millennium-era machine, a missing or worn sleeve is a likely, often-overlooked cause.