Rancilio Clever Valve, Left Side (2015 Version) Left-side Clever steam valve as redesigned by Rancilio in December 2015, mirroring the right-side unit, self-lubricating PEEK and graphite-filled PEEK 450 PVX cams, plus a PTFE conical seal in place of the older o-ring stem seal. COMPATIBILITY Fits: Rancilio machines using the C-Lever/15 valve system Replaces: Rancilio #R10701240 (left-side PEEK cam kit); a matching right-side kit is also available for the right valve Works with: The individual PEEK cams are also sold separately and are backward-compatible with pre-2015 valve bodies INSTALLATION Full valve replacement is a technician job; if only the cams are worn, the separate cam kit is a simpler DIY-level repair. PRO TIPS Skip the grease, these PEEK cams are self-lubricating thanks to their graphite content, and any added lubricant just collects grit that wears them out faster. If your pre-2015 valve is sticking or leaking, the separate cam kit alone often solves it without replacing the whole valve body.