Removing grey Hep2O grab rings

[MrDuck]

I wish to replace some grey (3rd gen) Hep2O connectors by 15mm service valves with compression joints, prior to fitting new taps. I gather that all should be well so long as I can fully remove the Hep2O fittings.

Is there a 'best' method for removing the grab rings, or am I better off just using side cutters to cut the rings off?

Any advice much appreciated.

 

[SandyLyon]

Are these the ones with the green plastic grab wedge ? If so you can gently walk them along the pipe.
If they are the older all metal grab rings, carefully cut them off,

 

[muggles]

Cut them off if you're not re-using them

 

[MrDuck]

Many thanks for that advice, which makes perfect sense.

Final question: Should I replace the pipe inserts with the latest stainless steel ones, or should the existing ones be OK for compression?