The present invention provides a leakage proof, water saving flushing device for effectively managing water resources through an interlocking mechanical assembly. The said interlocking mechanical assembly is made up from a water channel gate arm having a distal end and a gate end, and a floating air pocket arm having a floating air pocket end and a distal end. Wherein, the distal end of the said floating air pocket arm is placed perpendicularly against the said distal end of the said water channel gate arm and provides an interlocking mechanism. The said interlocking mechanical assembly also comprises an operating element adapted for providing a push force to an elongated connecting arm, wherein the said elongated connecting arm provides a push force to unlock the said interlocking mechanical assembly.