Product review (5 stars): The perfect kit.  But also replace the drain line.
Get this kit for a complete servicing of the humidifier.  But also, I strongly recommend replacing your drain hose (not included) and be sure there are no kinks whatsoever in the drain hose anywhere or the water may back up one day and start spilling out onto your basement floor.  In fact, if you can plumb a 3/4" PVC line for your unit to drain into (e.g., leading to your condensation drain pipe), that would be best.  This way, you don't have a flexible drain hose that kinks wherever there is a bend.