This Sea & Sea O-Ring Set is for the Sea & Sea MDX-D700, MDX-D800, or MDX-D810 housing for the Nikon D700, D800/E, or D810 camera. It includes the O-ring for the housing body, as well as silicone grease to prevent drying and cracking. The O-ring, resembling a thick rubber band, is designed to establish a watertight seal when going underwater.
Manufactured to precision tolerances required to hold a pressure seal on your housing and made of elastomeric material, an O-ring provides the means by which a watertight seal is formed. O-Ring care guide