If your shower control is leaking or your shower head is dripping then you will need a new cartridge
Cartridge Body, choose 164310 thermostatic or 164312 manual. (If it has AQUARIAN on the On/Off control it is thermostatic). Also thermostatic cartridges have a serial number beginning 'T' whereas Manual ones begin 'M'
On/off control: 164320 white, 164321 chrome or 164322 gold
Temperature control: 164325 white, 164326 chrome or 164327 gold
Front Shroud: 164315 white, 163316 chrome or 164317 gold
