You can buy a shur-flo drill pump at Home Depot for under $ 7.00, with hose threads on the inlet, and outlet sides, you can make-up a couple of short hoses to pump the anti-freeze through the City Water inlet, and your Black Tank flush line. I don't have the flush line on my 2006 Mountaineer, but I had it on my previous 5er, and this method works quite well.
P.S. I also use compressed air to purge the lines before adding the anti-freeze. It is amazing to see the amount of water in the system even after draining all the lines using the low point drains, and opening all the faucets.
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