This O-Ring Rebuilding Kit from Aquatica contains all necessary neoprene O-rings to rebuild the AD3s underwater housing for the Nikon D3, D3x or D3s, as well as 2 extra port O-rings and a container of silicone lubricant to keep rings from drying out and cracking.
Rebuilding requires a complete disassembly of the housing, which should only be attempted by trained and qualified individuals. A pressure test or immersion without a camera inside is mandatory after changing any O-ring. Failure to perform this test could result in serious damage to your camera and lens should the O-ring be improperly installed.