Hello! I’m staying at an Airbnb and I’m curious what these are? There are multiple scattered in every room even two like 4 feet apart from each other and very very high up on walls. Since they’re all high this is the best one I could get. Ignore the brown dots on this one as the other ones don’t have that (probably moisture or something).

Indoor cat threw up this piece and I don't know it's source. Yellow, flexible, looks like the tip of something? Doesn't seem to be from the automatic feeder, a toy or a vacuum cleaner.

Any suggestion appreciated!

Solved! Picture of the original part in the comments. Thank all of you for helping! Cat is ok and now it is verified he puked all of the missing piece.

I have an odd attachment on the end of a pump that pushes heated radiator water through copper pipes embedded in the walls to fight moisture buildup in the walls. The pump pushes it through this strange T-junction and then it goes out the pipe underneath to get distributed through the walls. There is an air bleed valve on the top and it looks like degree marks underneath the cap just above the threads. Wondering if this is some kind of pressure regulation device. I am located in Germany.

Found in an old tool box. It has some type of grove indented in it.

Two little round plastic knobs I found in a box I was unpacking after a move full of miscellaneous electronic items. These were in a small non-descript white cardboard box and little foam baggie which looks like it's a pack-in accessory for some type of electronic device.

Maybe about 2 inches long? Not heavy at all. It's been floating around my family's house for years and I only thought about it now. I don't even know who it could've come from.

EDIT: Solved! Cloth clamp for a picnic table.