Purpose: a water seal is arranged to buoyancy and improves its intensity, filling the water seal with the recycling foamed synthetic resin of the hollow parts made of foamed synthetic resin and forming an internal member. Construction: a water seal includes an external component (10) and an internal member (20). External component is recovered synthetic resin, and internal member is recovered foamed synthetic resin. External component is by a piece of top plate (11), plate (13) composition in one of lower plate (12) and one. Connecting hole arranged side by side (15) are formed in block. It is formed for the protrusion of connection and a slot by plate in being projected from top plate and lower plate. Several water seals pass through to be connected to tightly against each other for the protrusion and slot of connection.
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