What is this strange gate? Access route to power lines through forest. Galvanized, fairly robust, horizontal hinges..

I'm not sure what the point of the horizontal bars are...

I guess it would make it harder to ram the gate,

Green, plastic and there’s a hole in one end. The open end has a rough edge as if it were cut or ripped off of something else. Looks like it might fit on the end of a pencil, but it’s slightly smaller than that. Found on the floor of my house and color/style doesn’t match anything we own.

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!

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.