a cup or so in each. the point is to get antifreeze in the P-trap underneath each drain.
Since each drain generally has a faucet above it, as you run antifreeze through the system and out each faucet until you see antifreeze coming out, then go back and add an additional cup. It will be plenty.
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2009 F350 CC LB 4WD
2017 Jayco 355MBQS
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