In the event you have to ship your harmony XL system, you’re going to have to drain it. In order to drain it, you’re going to have to connect this funnel fitting to the fill port right here and also this vent fitting to the drain port, not the vent port. As soon as you do that water should be coming out. Once there’s no water coming out of it anymore, that’s how you know the system is drained because there’s pretty large reservoir in this. Could take upwards of a minute maybe two to drain it completely.