This Sea & Sea O-Ring Set is for the YS-120TTL Duo strobe. o-rings for a Sea & Sea 4 pin sync cord is included. 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.
UPC: 752221184204