Water feed device for an inclined moistener in a mail handling machine

A water feed device for feeding water to a moistener for moistening envelope flaps that is incorporated into a mail handling machine, the water feed device comprising a reserve stock of water from which a quantity of water flows to a reservoir of water, said quantity of water being suitable for imbibing a piece of foam dipping in said reservoir of water, said water feed device having at least two distinct water feed circuits for feeding water separately to at least two separate compartments of said reservoir of water from at least two isolated compartments of said reserve stock of water in a manner such as to define at least two distinct levels of water for the at least two isolated compartments of said reserve of water, and thus to define at least two different heights of water in the at least two corresponding separate compartments of said reservoir of water.