This Sony o-ring kit is for the underwater housings MPK-WB and MPK-THD. The housing MPK-WB is for the Sony DSC-W200, W90, and W80 digital cameras. The housing MPK-THD is for the Sony DSC-T100 and T20 digital Camera. 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.