Onan 4000 hose replacement

[TexasNative]

I've noticed the end of a hose is starting to get chewed up a bit. Does anyone have a part number/link (assuming I can buy online) for the hose circled in green?

https://get.google.com/albumarchive/101816963067355378244/album/AF1QipORQ820fkZvUGgaCC8PGh2SAz2CEaUj...

[TexasNative]

Much appreciated Chris!

[Chris_Bryant]

It's the breather hose-
http://www.ebay.com/itm/Cummins-Onan-Genuine-Factory-Breather-Tube-123-1917-Micro-Quiet-KY-/30231140...

[K_Charles]

I don't see a picture, what does the hose do?