A water inlet assembly (T) which is suitable for being used in a washing device (C) comprising at least one inner chamber in which cleaning operations are performed, at least one water inlet opening (Y1) allowing water intake to the inner chamber and at least a connection pipe (B) conveying the water coming from a source into the said water inlet opening (Y1), which is configured to prevent a leakage of the contaminated water into the connection pipe (B) and then into the water mains due to a reverse pressure that occurs during or after the water intake for washing and rinsing process and which comprises at least one body in the form of a hollow closed chamber having at least a first opening on at least one side thereof and configured to allow the connection between the said water inlet opening (Y1) and the connection pipe (B); and at least one connection area located on a surface of the body , including at least one hole and configured to allow the connection of the body to the water inlet opening (Y1); characterized by comprising at least one cover assembly positioned to close the said first opening , at least a part of which is inserted into the body through the first opening , and including: - at least one cover body closing the said first opening , - at least one water inlet section extending from one side of the said cover body , which is located on a part of the cover body , which is in the form of a chamber and by which the water coming from the source is entered into the body and exited from the body by passing through the connection area , - at least a second opening located on the said water inlet section and allowing air to enter the interior of the water inlet section , - at least one condensation section in the form of a chamber, extending into the body from the other side of the said cover body , located on the other part of the cover body and being configured to condense a part of the steam that is formed in the inner chamber during a drying process performed in the inner chamber and being entered into the condensation section by passing through the water inlet opening (Y1) and the connection area , and - at least a third opening located on a part of the said cover body where the condensation section is situated. - at least one cover body closing the said first opening , - at least one water inlet section extending from one side of the said cover body , which is located on a part of the cover body , which is in the form of a chamber and by which the water coming from the source is entered into the body and exited from the body by passing through the connection area , - at least a second opening located on the said water inlet section and allowing air to enter the interior of the water inlet section , - at least one condensation section in the form of a chamber, extending into the body from the other side of the said cover body , located on the other part of the cover body and being configured to condense a part of the steam that is formed in the inner chamber during a drying process performed in the inner chamber and being entered into the condensation section by passing through the water inlet opening (Y1) and the connection area , and - at least a third opening located on a part of the said cover body where the condensation section is situated. <EOS>