This is the newest commercial version for Rancilio now available, although it is also found in the Silvia Pro and Pro X. It includes the o-ring, finger guard and nut, as well as (not pictured - it's inside the nut) the PTFE seal for the ball of the wand.
It is longer than previous wands with an overall length of 200 mm.
Part is present in models:
SILVIA PRO X