There are two similar valves that have different lengths of threads on the back fitting. This valve has shorter threads. Its 1/4M BSP back threaded fitting that 16mm long. The longer version is 24mm and can be found on this link 1548091.
This has the front shaft with an “E” clip, so it isnotthreaded. (Please see this link for the square pin style.)
This Valve should be compatible with the following models:
Giotto 2009
Giotto Evoluzione 2 2017
Giotto Evoluzione V2 2013
However, due to changes through the years, we strongly recommend visually comparing your valve before ordering.