Are the Crosswater CA43-29, CA43-59 and CA43-102 cartridges interchangeable?

In short, yes. 

Due to ongoing product improvements, it is often necessary to update components. These updates often come with a change of SKU. The CA43-29, CA43-50 and CA43-102 are physically identical. Changes are internal and have been made to improve the performance and longevity of the product. These can be used in WLBP+ coded thermostatic shower valves from 2013 onwards.

New cartridges can be ordered via our official spares website.