This is a new Hansgrohe-manufactured TB2 cartridge 88586000, with over 300 sold; this includes the thermostatic cartridge and housing that holds the ceramic disks.  We highly recommend purchasing and replacing the entire cartridge, not just the housing or the thermo cartridge, while the unit is apart.  This unit includes the cartridge, silicon grease, and directions for installation.  We are the largest Hansgrohe/Axor parts supplier in the West, specializing only in Hansgrohe/AXOR. Forward any questions. Usually, it ships the same day or the next day. The manufacturer's list price is $200.

SHIPPING OVER NIGHT OR 2ND DAY AIR IS ONLY AVAILABLE IN THE CONTINENTAL US