Most modern RVs - and I think maybe all Thor’s - already have the necessary valve and pickup line for the antifreeze jug. Look for a clear plastic hose maybe two feet long with a cap or plug in one end and a valve at the other. Probably will be near the base of the fresh water tank but could be near the pump. Certainly it will be easily accessible and along the line from the fresh water tank to the pump. If it really isn’t present you can buy a Camco kit to add it yourself for about $15. It makes the job really easy.
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