Remove screw from Kraus Maffei 200-1000 C1

[8900265]

Hi, I am struggling to remove the screw coupling from a 1997 KM 200-1000 C1 (plate says C1, although I think the screen says C3M).
I’ve undone the 2x grubscrews, but can’t get the lock ring off. The manual doesn’t say it is a left hand thread but a post I’ve found on here says it is!
Does anyone know for definite which way I should be turning it?!

Thanks.