Run antifreeze from the fresh water tank?

I do not use the fresh water tank in my park trailer for anything but antifreeze! It came from the factory having been winterized from the fresh water tank. Easy peasy...I always made a mess with the outside pump set up.

There are after market "kits" you can buy for AF purpose. It's attached to the inlet/ suction side of the pump & can be used season after season. Does your RV have a hot water heater by-pass? Waste of money if it does & you don't use it, when using AF:h

Have you considered just using an air compressor to blow the water out of the lines?

I started using air only a couple years ago. I've had no freeze damage and, we've had some cold winters in our area.

Just pour antifreeze in the any P traps.

The first time I winterized, I poured the antifreeze in the water tank and pumped it through the lines. It worked but, used a lot of antifreeze.

The air method works best for me.

I have done it this way in years past and it works ok. We do not drink the tank water so we just flush it out in the spring and all is ok. Still you should drain your water heater or you will use a lot of antifreeze solution.

You would probably have to put a lot of antifreeze into your tank to get the pump to draw. I know I would. Could get expensive.

Used to do my old PUP that way ... It works, but man it takes a lot of water to get the taste out in the spring... You can get winterization kits that have a valve, connectors, and hose that attach in front of the water pump. Quick and easy to install.

It will work, but you are going to have a hard time getting all the RV antifreeze out of the tank in the spring...Go buy a piece of hose and a clamp..maybe $5