Abstract: A watercraft comprising a hull, and a polymer layer disposed over an inner side of the hull. The polymer layer has a thickness of between 1 to 5 millimeters, and an elasticity of between 100% and 1200% elongation. The watercraft comprises the hull and the polymer layer, where the interface layer adheres the polymer layer to the inner side of the hull at an adhesion strength of between 0.5 to 1.2 mega-Pascal (MPa).

Abstract: An inflatable connector comprising a bladder having at least two pipe securing areas formed as at least two separate cylindrical voids, respectively, in said bladder, wherein said at least two separate cylindrical voids are completely separated by a portion of said bladder and are configured to at least partially encompass at least two pipe portions, respectively, wherein said bladder is configured, when deflated, to enable insertion of said at least two pipe portions into said at least two pipe securing areas, respectively, and wherein said bladder is configured, when inflated, to secure said at least two pipe portions in said at least two pipe securing areas, respectively.

Abstract: An inflatable connector comprising a bladder having at least two pipe securing areas formed as at least two separate cylindrical voids, respectively, in said bladder, wherein said at least two separate cylindrical voids are completely separated by a portion of said bladder and are configured to at least partially encompass at least two pipe portions, respectively, wherein said bladder is configured, when deflated, to enable insertion of said at least two pipe portions into said at least two pipe securing areas, respectively, and wherein said bladder is configured, when inflated, to secure said at least two pipe portions in said at least two pipe securing areas, respectively.