What is this?

[Patrik_N]

Found a box of this, but what is it? About 10cm in diameter and 5-7 wide.
Looks like some joints, but for what?

 

[Fotografen]

Joints for clay pipes.

 

[Patrik_N]

Aha! Then the follow-up question comes.
How likely is it that I would have clay pipes when the house is from '78? Didn't they use plastic then?

 

[Fotografen]

Not entirely impossible.

 

[Fotografen]

So very much later I recall that a classmate in fourth grade, we're talking the year 1981, drained around the house, or the parents did the draining, and then clay pipes were laid down, in 1981. From there, I remember these joint rings. So into the '80s anyway.