N200 Extension Ring 30The N200 Extension Ring 30 is part of the N200 Port System and can be used to add 30mm effective length to an N200 Port setup. See Port Chart for more details on choosing the correct extension and port. Technical Specifications Depth Rating 100m Port System N200 Weight Port Opening Diameter Port Diameter Body Material Anodized Aluminum Alloy Port Material Port Coating Port Shade Material Removable Port Shade Spare O ring split