Sowing element for agricultural precision sowing machines and sowing machine comprising the sowing element

An agricultural precision sowing machine including a plurality of sowing elements, where each of the sowing elements comprises a seed selection device which includes a casing and a perforated disc which is caused to rotate in the casing, wherein a pressurization device is associated with the casing in order to subject opposite faces of the disc to a pressure differential, and wherein an opening is provided in the casing in order to ventilate one of the faces of the disc, wherein the opening is pneumatically connected to a filtration system or to a remote intake system, wherein the box-shaped casing comprises a fixed box-shaped body and a cover which is removably applied to the box-shaped body, the opening being formed in the box-shaped body, wherein in a region of the opening, at least one manifold is formed on the box-shaped body for an intake pipe or a delivery pipe of the pressurization device, where the box-shaped body comprises a first manifold which is connected to a ventilation system which is capable of subjecting a face of the disc to a negative pressure and a second manifold is connected to the filtration system or to the remote intake system.