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I don't have a manual that explains it but I'll try to explain how I did it. NAPA sells a special valve that attaches to your tire valve stem. They have two different versions. One is very expensive the other is only about $15. It has a connection for standard garden hose. Jack up the tire, remove the valve stem core and rotate the tire so that the valve stem is between 10 and 2 o'clock. Attach NAPA valve stem adapter. If you live in a warm climate where it rarely freezes, but connect the garden hose and turn on the water. If you need anti-freeze, then you'll have to choose which type you want. Calcium Chloride gives the most weight and is most commonly used, but is very corrosive. Any leaks will result in rust damage to your rims. Other options include a product called RimGuard (I think) which is basically beet juice as I understand. Some advocate windshield washer fluid or RV antifreeze. Regular automotive antifreeze could also be used, but usually isn't because of the risk of killing your dog if it leaks out. Once you have decided what you want to use and in what solution (I used a 50/50 mix of water and RV antifreeze) then you need a way to get it into the tire. I used a hand pump that had a hose bib connection. There are charts in owners manuals telling you how many gallons each tire size will hold. I put half that in the tires and then topped it off with water to get my 50/50 mix. Before I found this pump, I was intending to use gravity. I had plans to cut a hole in the bottom of a plastic bucket, then attach a hose fitting to the hole. I had visions of standing on a ladder holding a bucket of antifreeze as it drained into the tire. That would have taken a while. I'm glad I found the pump.
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