I was using a o-ring around the hose but found it sliding to much so have switched to cave line to the bolt snap. So far I am happy with the change. The link below shows how to tie the knots using cave line. Hope this helps.
http://homepage.mac.com/joe_at_subtidal/PhotoAlbum25.html
http://homepage.mac.com/joe_at_subtidal/PhotoAlbum25.html