S Series Port Hole and Lens Element O-ring
This o-ring is made out of NBR with a special hardness shore. It will perfectly secure the seal between the S ports series and the C6X00 main shell. They are also used to seal the S flat port series with the front glass element.
This o-ring is crafted to the precision tolerance required to hold a adequate seal between Liquid Eye S ports/Glass element/C6X00 water housing. NBR o-rings are easy to maintain.
It is important to keep them free of sand or dirt. You can slightly grease them once in a while. For salted waters, it is highly suggested to use marine grease. Just put some marine grease on your fingers and slide the o-ring between your fingers to apply a thin coat of lubricant on the rubber. It is not recommended to over lubricate the o-ring. It may end up by sticking sand and other debris. A shinny look is fine.
Please kindly note that using another type of O-ring to seal your S port (port hole or port lens) may cause severe leak and void the warranty.