I noticed a hose that is beat to crap. I'd like to replace it but I'm not sure what it is called or does.

Help pls.Click image for larger version. 

Name:	20130129_115806(0).jpg 
Views:	89 
Size:	72.9 KB 
ID:	48690Click image for larger version. 

Name:	20130129_115812.jpg 
Views:	89 
Size:	48.0 KB 
ID:	48691