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Oil-to-sea interfaces are a key concept in marine lubrication, and an important area of focus for both compliance and environmental performance. Under the 2013 US Vessel General Permit (VGP) , an oil-to-sea interface refers to any lubricated equipment where oil comes into contact with seawater and where there is a reasonable potential for discharge during normal operation. More specifically, the EPA identifies several types of equipment as oil-to-sea interfaces because they are fully or partially submerged and rely on oil lubrication. These include: Stern tubes Controllable pitch propellers...