Sorry. I have to go against the anti-freeze folks here. I don't know of anyone who has ever taken that route that didn't have bad luck, whether it be all the AF leaking out over time and all over the floor, or the AF not being distributed properly and drain valves freezing up and breaks due to expansion. I am all for total draining and evacuation by air pressure. Upon the impending freezing weather, I open every valve that exists on the truck, and remove all the caps. Let it drain down while driving it around for a few miles to "slosh" everything out. (Remembering that if there is residual water in the tank it has room for expansion and therefore is not as critical.) When I get back to the barn, I close everything back up. I have a 2.5" discharge cap that I drilled out and tapped with the proper threads to receive a male air coupling. I put it on a discharge, and pressurize the pump with 5-10psi of air. Now open each and every valve and drain one at a time and let the air push everything out. Repeat for several cycles. | When you are done, open every valve back up and leave them open, juuuuuuuust in case if there does happen to be any more residual water in there, the valves wont trap it and create expansion breaks. I have never had any issues using this method.