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What size hex wrench do I need to remove the oil fill plug in the Leybold SV40BI pump on the SQD? - WKB6849

Article number: 6849


  • SQD
  • TQD
  • Leybold SV40BI
  • Leybold SV65BI


The original pump required an 8-mm hex wrench. The manufacturer changed the oil fill plug and the oil drain plug, so they now require a 12-mm hex wrench. This change was effective 17 June 2010 and corresponds to pump serial number 31000221916 and higher.


Tools are not covered under a service plan. Waters offers the 12-mm wrench as "700006076 12 mm Hex wrench", or you can purchase it from a hardware or home improvement store.

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