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ISO 4548-9:2008 Methods of test for full-flow lubricating oil filters for internal combustion engines - Part 9: Inlet and outlet anti-drain valve tests
standard by International Organization for Standardization, 02/01/2008
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ISO 4548-9:2007 specifies methods of measuring the effectiveness of either inlet or outlet anti-drain valves if fitted to a full-flow lubricating oil filter of the spin-on or easy change type, for internal combustion engines.