The J-Tube Seal work to centralise and partially seal a cable in the J-Tube riser of an Offshore Wind structure. The J-Tube Seal are composed of a Ductile iron body with flexible Polyether ears. The J-Tube Seal is attached to a cable prior to deployment for a diverless installation. The J-Tube seal is used for the offshore wind industry but can also be used for oil and gas structures.