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![MARELUX 40 extension ring with lock MARELUX 40 extension ring with lock](https://www.tekplongee.fr/boutique/12632-medium_default/marelux-40-extension-ring-with-lock.jpg)
Thanks to the extension ring with locking from MARELUX, you can extend the port of your 40mm port system.
To fit a wet lens with 52mm thread into a housing with a port of 67 mm
Thanks to the extension ring with locking from MARELUX, you can extend the port of your 70mm port system.
Thanks to the extension ring with locking from MARELUX, you can extend the port of your 90 mm port system.
Thanks to the extension ring with locking from MARELUX, you can extend the port of your 20mm port system.