Some great advice in this thread. One question about draining regarding the section between the city hook up and where it enters the main part of the system. Never winterized a camper myself before and just did the drain and antifreeze method last weekend. Some advice from a seasoned RV veteran was to push in the one way check valve at the city hook up when draining then again when filling with antifreeze, but my problem was not finding anything other than a screen that didn't look like it was removable. I'm pretty sure it was drained (it runs downhill and was loose enough to shake a little), but not so sure it refilled with the pink. Should I be worried? Every other part of the system was refilled, traps, toilet even some in the tanks just in case.