BS 7403-9:1995 Full-flow lubricating oil filters for internal combustion engines - Part 9. Method of test for inlet and outlet anti-drain valves
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This part of ISO 4548 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 com-
bustion engines.