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Tyler may have the best answer, but if you want to do it yourself, buy the filler attachment from your tractor dealer (any tractor dealer). It connects a tire's Schraeder valve to the male end of a garden hose. Then you also need a short piece of garden hose with the male end, and a funnel. The hose piece and funnel are used to pour in the antifreeze. Then connect a garden hose and fill to 75% full. Set fill level by where you have the valve positioned on the parked tractor. Fill until water starts to runs out the valve when you let the air out. This takes a BUNCH of antifreeze though. I used a 1:4 mix and still put about 10 gallons of antifreeze in each 24in tire, even though it's warm here in Central Tx. Calculate what you need from finding the volume of your tire and use the back of the antifreeze jug to calculate the ratio you need for your min temp. math example: Volume of a torus is V=2 times pi-squared times R times r-squared. (R is distance between tire crossection centers, r is radius of tire crossection). For 24in wheels, this works out to 10 cu ft (about). Times 7.5 gal/cu-ft is 75 gallons. Fill to 75% and you have 56gal. 10 gal of antifreeze and 40 gal of water make a 1:4 mix. Or about $40 per tire doing it yourself. If you live where winters are real, you probably need to use a 1:2 or 1:1 mix making the $175 figure start to look pretty fair. Lastly (on a very long post, sorry) is to be really careful around cats and dogs. Antifreeze tastes good to them and will kill them quickly.
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