Help identify hose
 

I have a mystery hose in my BF150. It’s a small grey hose with a red stripe and not connected to anything. It’s a little over a foot long. The inside diameter is small so I would think it’s some kind of sensor tube? Can anyone help with this?
https://cimg6.ibsrv.net/gimg/hondafo...6ac5409e7.jpeg
https://cimg7.ibsrv.net/gimg/hondafo...6ed18ea33.jpeg