This Sea & Sea O-Ring Set is for the Sea & Sea MDX-MKIII and MDX-D3 housings. The set includes the body o-ring for the housing. 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, it provides the means by which a watertight seal is formed.