This Sea & Sea O-Ring Set is for the YS-01, YS-02, YS-90, YS-110, YS-110a YS-27, YS-30, and YS-D1 strobes. The O-ring resembling a thick rubber band is designed to establish a watertight seal when going underwater. Made of elastomeric material and manufactured to the precision tolerances required to hold a pressure seal on your housing, it provides the means by which a watertight seal is formed.
UPC: 752221105803