A water application device (10/100/300) comprising: a main body (20/110/110') graspable along a handle portion (22/119) thereof by an operator, the handle portion (22/119) including a back attachment portion configured to be held toward the operator during water application; a flow control assembly housed in the main body (20/110/110'), the flow control assembly including a volume control assembly to control volume of flow of water through the device (10/100/300); an operable member (30/140) attachable to a front of the handle portion (22/119) to interface with the flow control assembly to alternately start and stop flow based on a position of the operable member (30/140); and an applicator head (40/120/122) attachable to an outlet of the main body (20/110/110') to apply water passing through the applicator head (40/120/122) based on an application characteristic of the applicator head (40/120/122), characterized in that a cover assembly is attached on the back attachment portion; a planar surface is provided on the cover assembly on the back attachment portion, the planar surface lies in a plane joining or intersecting a longitudinal centerline of the cover assembly on the back attachment portion at a point along a length of the cover assembly on the back attachment portion and is substantially parallel to a length of the axis of the handle portion (22/119), the planar surface defines at least part of a range of motion of a flow control lever of the volume control assembly, the cover assembly includes a curved back portion, the curved back portion comprises an enclosure portion extending outwardly and away from a back surface of the cover assembly, forming a receiver configured to enclose at least a portion of the flow control lever and separating the curved back portion from the planar surface, and wherein the flow control lever comprises a stem portion extending into the volume control assembly and a tab extending along the planar surface. a main body (20/110/110') graspable along a handle portion (22/119) thereof by an operator, the handle portion (22/119) including a back attachment portion configured to be held toward the operator during water application; a flow control assembly housed in the main body (20/110/110'), the flow control assembly including a volume control assembly to control volume of flow of water through the device (10/100/300); an operable member (30/140) attachable to a front of the handle portion (22/119) to interface with the flow control assembly to alternately start and stop flow based on a position of the operable member (30/140); and an applicator head (40/120/122) attachable to an outlet of the main body (20/110/110') to apply water passing through the applicator head (40/120/122) based on an application characteristic of the applicator head (40/120/122), characterized in that a cover assembly is attached on the back attachment portion; a planar surface is provided on the cover assembly on the back attachment portion, the planar surface lies in a plane joining or intersecting a longitudinal centerline of the cover assembly on the back attachment portion at a point along a length of the cover assembly on the back attachment portion and is substantially parallel to a length of the axis of the handle portion (22/119), the planar surface defines at least part of a range of motion of a flow control lever of the volume control assembly, the cover assembly includes a curved back portion, the curved back portion comprises an enclosure portion extending outwardly and away from a back surface of the cover assembly, forming a receiver configured to enclose at least a portion of the flow control lever and separating the curved back portion from the planar surface, and wherein the flow control lever comprises a stem portion extending into the volume control assembly and a tab extending along the planar surface.