I appreciate the reply. I've personally never had much luck running pumps dry with the seacock open. It has cost me at least two, maybe three livewell pumps on my last ride (over the course of 20 years). I could have been related to that particular setup but I'm not taking any chances. I'm hoping to create some quick disconnects for the live well and washdown (if they don't already exist). Then I'll just use the pump to pull antifreeze through the system. I'll pump out the head and flush a half gallon or more into that system. ...At least, that is my current plan.