Thank you for your inquiry, Dillpickle! The Delta Classic Tub and Shower T13420-SHC comes with the RP46074 valve cartridge assembly. The T13420-SHCCER model comes with the ceramic valve cartridge assembly RP74236. If you do not have the model with the "CER" ending letter, you would need to purchase the RP74236 separately, if you are looking for the ceramic cartridge.
Date published: 2018-08-02