When in place, this extension ring (SKU: # na-21120) effectively adds an additional 20mm length to any N120 Port or N120 port extension ring. This 20mm Nauticam Extension features the locking mechanism to lock what ever model N120 dome or marco port, or addition extension ring that is mounted to its front.
This extension ring (SKU 21120) features a removable bayonet mount and is compatible with Nauticam Extension Ring 10 (SKU 21110).
The extension ring comes as shown in the photos and comes in the original box with rear port cover, spare O-ring and tube of Nauticam O-ring grease.
Free shipping included with the $180 selling price.