The replacement hose is not a stock item.  We recommend CLEAR VINYL TUBING which can be purchased at Home Depot, Lowes, Menards, and other local hardware stores.  The outside diameter of the #17 drip tray opening is 5/8" (0.625).  The tubing size to fit is 3/4" (0.75) outside diameter x 5/8" inside diameter.  Most stores sell by the foot and will cut to size.