Nimar Extension Ring 20 with Lock (0.78")

Boost your lens options when shooting underwater with the Extension Ring 20 with Lock from Nimar. Designed to add 0.78" of effective length to a compatible lens port, this extension ring enables you to fit longer lenses into your underwater housing. The extension ring is made of anodized aluminum alloy and has a depth rating of 328'. Included with the ring are a bayonet mount rear port cap and two O-rings.