The product on its packaging indicates yet full compatibility with the SAMSUNG RSG5PURS, which is not true.
After some research, it appeared that the fixing system was changed in 2010, but still carries the same reference, I am equipped with the new head (fridge 2013) and there are only the old heads. This problem is regularly recovered by buyers on sites that sell cartridges (amazon us, etc ...).
I was given an email and a Samsung file number, but it seems that the service and client relations are not their forte.
For the handymen, a Dremel attachments and machining then resolve the problem, but I do not recommend forcing as seen sometimes written in the comments of some buyers who have not paid attention to the difference thread.