We provide free air from our exsisting AC for the past almost 30 years. Customers use it. like it[/QUOTE
We have done the same for 20 years or so. Asco valve and a vac timer...its what Dad had laying around. Paid for that 10 gallon Sanborn compressor few times over.
Mac...I charge a $5 dollar fee for rotating the air in customer's tires.