Failures (leaks) in the Sprinter's turbo plumbing have been a consistent bane for both T1N and NCV3 owners.
I vaguely recall that MB finally added a little bit of length to one of the NCV3 turbo hoses to try to lower the "torn end" occurrence, but that could be a figment of my imagination (or faulty memory). Since i've got a T1N, i only noted it in passing, versus diligently dug into it.
(my turbo resonator duly cracked a couple of years ago and i replaced it with a $30 3rd party (Dorman) unit, instead of the $130 3rd party "Will Never Die" aluminum pipe option.)
So: the adapter may/will
help prevent the problem, but it's not going to
guarantee that you won't get a leak... and the hose could die somewhere else along its length (eventually).
There have been numerous threads (more for the T1N than the NCV3) about turbo leaks ... the Search function, limited to the NCV3 threads, would probably give you a better hint as to how frequent/prevalent the issue is, and whether or not it has diminished over the recent years.
The
Sprinter Store (Upscale Auto in Oregon) also sells the/an NCV3 adapter (indeed, they may have been the original developers).
--dick