Window unit with glass reversal in the position and locking in two ways including: - a fixed frame, characterized by the fact that it presents a profile capable to permit, when overlapping with the door leaf, a stable interpenetration with the said door leaf and to allow the drainage of the liquids penetrating between the said fixed frame and the said door leaf by means of a hollow portion of the profile of fixed frame; - A single door leaf that slides horizontally and vertically rotates in opening and closing in regard to the said fixed frame, characterized by the fact that it presents a profile fitted to allow, in overlapping position with the fixed frame, a stable interpenetration with the said fixed frame and to drain liquids, penetrating between the said fixed frame and the said door leaf, via the hollow portion of the said fixed frame by means of two grooves arranged on the oblique surface of the profile of the door leaf in the proximity of the hollow zone of the fixed frame; - A gasket positioned between the fixed frame and the door leaf, associated to the oblique surface of the profile of the fixed frame and located on the two uprights and the two crosspieces of the fixed frame, to guarantee a thermal seal in the closed position; - Two fixed rigid elements, horizontally positioned in respect to the fixed frame and positioned on the inner surface of the top and bottom of the fixed frame, characterized by the fact that they have a double-cone profile adapted to allow the horizontal sliding of the rigid element, a rigid element for each of the rigid elements, by means of the wheels presenting a negative conical outline in comparison with the conical outline of the fixed rigid elements; - Two rigid elements sliding horizontally, having a form adapted to house a ball bearing, wrapping the fixed rigid element associated to the lower surface of the rigid angled element act to support, to slide and to rotate the door leaf; - Two rigid angled elements, on witch are present ribs, adapt to support the lower and upper part of the door leaf, associated, one rigid element by corner, to the corners formed by the right or left upright of the upper crosspiece and the lower crosspiece of the door leaf. - A rigid horizontally rotating element, repeatable n times, but at least repeated twice, associated to the uprights of fixed frame presenting a spring-loaded piston housing a portion of a sphere to which exert a continuous force, associated, posthumous rotation, to the uprights of the door leaf so to exercise a continuous force on the door leaf allowing locking. - a fixed frame, characterized by the fact that it presents a profile capable to permit, when overlapping with the door leaf, a stable interpenetration with the said door leaf and to allow the drainage of the liquids penetrating between the said fixed frame and the said door leaf by means of a hollow portion of the profile of fixed frame; - A single door leaf that slides horizontally and vertically rotates in opening and closing in regard to the said fixed frame, characterized by the fact that it presents a profile fitted to allow, in overlapping position with the fixed frame, a stable interpenetration with the said fixed frame and to drain liquids, penetrating between the said fixed frame and the said door leaf, via the hollow portion of the said fixed frame by means of two grooves arranged on the oblique surface of the profile of the door leaf in the proximity of the hollow zone of the fixed frame; - A gasket positioned between the fixed frame and the door leaf, associated to the oblique surface of the profile of the fixed frame and located on the two uprights and the two crosspieces of the fixed frame, to guarantee a thermal seal in the closed position; - Two fixed rigid elements, horizontally positioned in respect to the fixed frame and positioned on the inner surface of the top and bottom of the fixed frame, characterized by the fact that they have a double-cone profile adapted to allow the horizontal sliding of the rigid element, a rigid element for each of the rigid elements, by means of the wheels presenting a negative conical outline in comparison with the conical outline of the fixed rigid elements; - Two rigid elements sliding horizontally, having a form adapted to house a ball bearing, wrapping the fixed rigid element associated to the lower surface of the rigid angled element act to support, to slide and to rotate the door leaf; - Two rigid angled elements, on witch are present ribs, adapt to support the lower and upper part of the door leaf, associated, one rigid element by corner, to the corners formed by the right or left upright of the upper crosspiece and the lower crosspiece of the door leaf. - A rigid horizontally rotating element, repeatable n times, but at least repeated twice, associated to the uprights of fixed frame presenting a spring-loaded piston housing a portion of a sphere to which exert a continuous force, associated, posthumous rotation, to the uprights of the door leaf so to exercise a continuous force on the door leaf allowing locking.