This thermostatic cartridge did come in brass but is now made in new and improved polymer material. This new plastic version of the cartridge may look visually different however it is the correct cartridge. If your cartridge has a spindle adaptor please re use your old one as this is not supplied.
Total Length: 100MM
Spline Diameter: 10.6
Teeth / Notches: 32
Diameter at Top O'ring: 32.1mm
Diameter at Middle O'ring: 31.15mm
Diameter at Bottom O'ring: 29.25mm