Pelastusrengas in the Lake Again

As you suspected, Pelastusrengas is Finnish for Lifebuoy. Here in Leeds, we keep ours in the lake, mostly:

There it was, in Waterloo Lake, Roundhay Park, this morning, floating merrily near the middle.

Perhaps whoever chucked it in thought that it might save time, if anyone should happen to fall in, if the lifebuoy was already there, ready and waiting. How very considerate.