Vado CEL-001A-WAX Thermostatic Cartridge Shuttle for Celcius CEL-179 and CEL-279 Shower Valves. The piston is used in the SNINASF cartridge housing. If you need the entire SNINASF assembly, it can be found here: Front Housing and Thermostatic Cartridge for SNINASF CEL-001A-WAX ...