I apologize. I think I asked this first in the wrong forum. Pasting again here. I’m following the Oliver Winterization video step by step. All pretty straightforward. I’m at the step of pumping antifreeze into the fresh water tank. I’ve drained it as fully as I can, but it isn’t clear whether or not I should close the drain valve before putting in the antifreeze. Maybe a silly question; I just wasn’t sure.