A cover device for at least partially closing an underwater opening in a hull of a watercraft includes a variable-volume hollow-chamber lip assembly including at least two hollow-chamber lips and one buoyancy body. The at least one hollow-chamber lip is volume-variable by supplying a fluid to or removing a fluid from an interior thereof, and the at least one hollow-chamber lip assembly is shiftable between an expanded state and a contracted state by supplying or removing the fluid.

A marine thru-hull fitting and drainage device for directing fluid away from a hull of a vessel. The thru-hull fitting includes a thru-hull body and a thru-hull flange formed on an end of the thru-hull body. The thru-hull flange includes an attachment portion formed on at least a portion of the face of the thru-hull flange, the attachment portion located adjacent to a discharge outlet of the thru-hull. A drainage device is secured on the attachment portion, the drainage device including U-shaped channel body having a substantially U-shaped cross-sectional area along a length of the body such that the body forms a channel for directing fluid from the discharge outlet along the body, the body extending from a first end proximate to the face of the thru-hull flange to a second end that is distal from the thru-hull flange.

A marine thru-hull fitting and drainage device for directing fluid away from a hull of a vessel. The thru-hull fitting includes a thru-hull body and a thru-hull flange formed on an end of the thru-hull body. The thru-hull flange includes an attachment portion formed on at least a portion of the face of the thru-hull flange, the attachment portion located adjacent to a discharge outlet of the thru-hull. A drainage device is secured on the attachment portion, the drainage device including U-shaped channel body having a substantially U-shaped cross-sectional area along a length of the body such that the body forms a channel for directing fluid from the discharge outlet along the body, the body extending from a first end proximate to the face of the thru-hull flange to a second end that is distal from the thru-hull flange.

A seat enclosure includes a number of seats located at the perimeter of a vehicle to form a barrier. The seat includes a base with a panel attached to the backside of the base to give the seat enclosure a finished appearance.

A seat enclosure includes a number of seats located at the perimeter of a vehicle to form a barrier. The seat includes a base with a panel attached to the backside of the base to give the seat enclosure a finished appearance.

A check valve for a vessel having at least one port for a buoyancy chamber. The check valve having a valve body fitted to sealingly engage the port and a stopper retained within the valve body and be moveable from a dosed position limiting water from entering the port to an open position permitting drainage of water from the port.

A check valve for a vessel having at least one port for a buoyancy chamber. The check valve having a valve body fitted to sealingly engage the port and a stopper retained within the valve body and be moveable from a dosed position limiting water from entering the port to an open position permitting drainage of water from the port.

A vessel has a compartment (34) for containing water, which compartment (34) has at least one opening (31) in a wall (30) thereof for allowing water to pass therethrough. The compartment (34) comprises an assembly (1) of a grating (10) and at least one anti-biofouling source (20), the grating (10) being positioned in the opening (31) for blocking items from passing through the opening (31) along with the water, and comprising a number of elements and spaces between the elements, and the anti-biofouling source (20) being configured to emit ultraviolet light during operation thereof for realizing anti-biofouling of at least a portion of the grating (10). At least one of the elements of the grating (10) is at least partially transparent to the ultraviolet light, enabling a design of the assembly (1) in which anti-biofouling of the entire grating (10) may be guaranteed.

Systems and methods are presented of operating a seawater system to reduce fouling. The seawater system may be installed in a waterborne vessel. A method comprises establishing suction in a first manifold, drawing seawater through a first manifold port, and discharging seawater through a second manifold simultaneous to drawing fluid through the first manifold port. The first manifold is in fluid communication with a first manifold port defined by a cover assembly. The second manifold is in fluid communication with a second manifold port defined by the cover assembly. The cover assembly is positioned in contact with a body of seawater.

Systems and methods are presented of operating a seawater system to reduce fouling. The seawater system may be installed in a waterborne vessel. A method comprises establishing suction in a first manifold, drawing seawater through a first manifold port, and discharging seawater through a second manifold simultaneous to drawing fluid through the first manifold port. The first manifold is in fluid communication with a first manifold port defined by a cover assembly. The second manifold is in fluid communication with a second manifold port defined by the cover assembly. The cover assembly is positioned in contact with a body of seawater.