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. <EOS>