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There are many kinds of anti-freeze out there for your RV, you can find it almost anywhere, just keep in mind you want one that can protect to -50F AND IT SAYS RV antifreeze, it is NOT CAR/TRUCK antifreeze.
This is an item you might not need depending on your RV. If you have questions, don’t hesitate to contact me, my contact info is at the top of the page.
If you purchase this one I highly recommend you put a clamp where the grey tube meets the black part, otherwise you risk it popping off and ending up in your water heater tank.