OM System Silica-5S Silica Gel Desiccant (5 x 1g)

Warm humid air sealed inside a housing condenses on the port the moment the case hits cold water, and there is no way to clear it once you are down there. A desiccant sachet inside the case absorbs that moisture before it can settle on the glass.

This is the OM System replacement pack: five 1g sachets, sized for the PT-series housings. They are consumables, so keep a pack in the dive bag and use a fresh one each time the case is opened in humid air.