Those grips are made to make the life easier in cold or icy water.
After a long dive it's often difficult for the diver to disconnect their inflation hoses.
Especially with dry suit, the inflation valve hose is hard to disconnect with icy hand.
those grips are clipped on the steal part, the quick connector.
ArianePlast PLA or ABS
Those are printed with PLA, but for better longevity in water, ABS will be better I think