8mm compression adaptor instead of olive

[Disk]

I am about to replace old rad valves with Danfoss TRV's.
The system is 8mm copper microbore.
To fit the 8mm pipe the TRV's come with a brass adaptor rather than a separate olive. The adaptor is supposed to 'collapse' and seal against the pipe like an olive when tightened but it looks quite a meaty brass fitting.
Danfoss just say tighten it up and it'll be ok.
Has anyone had any experience with this type of adaptor? Have you found it reliable as far as creating a water tight seal and did you use any special measures to ensure the seal?

 

[chrishutt]

Just make sure you put it in the right way round, tighten it until you hear a "crack" as the thin join between the 2 parts breaks, then tighten some more, but not too much. If it leaks a little when tested, just tighten a little more.

Make sure you use 8mm reducer and not 10mm one. Should be nice close fit around pipe.

 

[Disk]

Many thanks Chrishutt