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Wärtsilä Stern Tube SolutionsOur packages are all designed to meet certain standards and can becustomised to suit specific applications. Options include oil lubricatedsterntubes with white metal or composite bearings or water lubricatedsterntubes with composite bearings.Wärtsilä Other Seals & Bearings ProductsWärtsilä water quality systemsPumped water flush supply systems with various filtration andtemperature control options to improve and increase life of the seal andbearing products installed. Systems are adapted to suit applicationseither by filtering to required standards in silty/ gritty water environmentsor controlling closed water temperature in ice-class type applications.Suitable for both open and closed water lubricated sterntubes.WATER QUALITY SYSTEMSFlush Supply & FiltrationWärtsilä Water Quality System: open water (clear), WYS-MWärtsilä Water Quality System: open water (high performance- silty), WYS-MXFlush Supply, Filtration & Temperature ControlWärtsilä Water Quality System: closed water system, WQS-M171