valve near water pump question
First time winterizing this unit and haven't winterized any RV in 10 yrs so things are a little different LOL.
I have one question in the water pump area. Probably obvious to most but I want to be sure. It comes with an "antifreeze port" already installed so I will remove the cap at the AF port and put one end of the tubing there and the other in the AF bottle. You can see a valve in the picture, it seems I would need to turn that before I start running the AF through the system, is that correct?
I think I have all the other steps and the WH bypass part figured out.
Thanks very much in advance,