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Since Keystone states both as options, they think that done right, blowing out the lines works even in cold states. My dealer uses the blow out method. Since I pull my RV out in January, I have to winterize multiple times, so antifreeze cost is a real consideration.
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Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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