A work vehicle comprising: a frame structure; and a plurality of row units that each include: a row unit support structure attached to the frame structure; a meter housing with a housing member and a cover, the housing member being attached to the row unit support structure, the cover having an attached position in which the cover is removably attached to the housing member to define an interior of the meter housing, the cover having a detached position in which the cover is at least partly detached from the housing member to provide access to the interior; a metering element that is housed within the interior of the meter housing, the metering element configured to singulate a commodity and meter the commodity from the meter housing; and an air pressure device configured to generate an air pressure differential across the metering element to retain the commodity on the metering element, characterised in that the air pressure device being fixed relative to the row unit support structure, the air pressure device configured to remain fixed relative to the row unit support structure as the cover moves between the attached position and the detached position. a frame structure; and a plurality of row units that each include: a row unit support structure attached to the frame structure; a meter housing with a housing member and a cover, the housing member being attached to the row unit support structure, the cover having an attached position in which the cover is removably attached to the housing member to define an interior of the meter housing, the cover having a detached position in which the cover is at least partly detached from the housing member to provide access to the interior; a metering element that is housed within the interior of the meter housing, the metering element configured to singulate a commodity and meter the commodity from the meter housing; and an air pressure device configured to generate an air pressure differential across the metering element to retain the commodity on the metering element, characterised in that the air pressure device being fixed relative to the row unit support structure, the air pressure device configured to remain fixed relative to the row unit support structure as the cover moves between the attached position and the detached position. a row unit support structure attached to the frame structure; a meter housing with a housing member and a cover, the housing member being attached to the row unit support structure, the cover having an attached position in which the cover is removably attached to the housing member to define an interior of the meter housing, the cover having a detached position in which the cover is at least partly detached from the housing member to provide access to the interior; a metering element that is housed within the interior of the meter housing, the metering element configured to singulate a commodity and meter the commodity from the meter housing; and an air pressure device configured to generate an air pressure differential across the metering element to retain the commodity on the metering element, characterised in that the air pressure device being fixed relative to the row unit support structure, the air pressure device configured to remain fixed relative to the row unit support structure as the cover moves between the attached position and the detached position.