Nikon WP-03000 O-Ring for SB-N10 Underwater Speedlight

The WP-03000 O-Ring from Nikon is used to protect the watertight integrity of the battery compartment on the SB-N10 Underwater Speedlight Flash for Nikon 1 Cameras in Waterproof Housings. The o-ring resembles a thick rubber band and when kept properly lubricated, will prevent water ingress to safeguard your equipment against damage while beneath the surface.