This O-Ring Maintenance Kit from Aquatica contains the user-replaceable O-rings for their A5D Underwater Housing for the Canon 5D Mark III digital SLR camera. Additionally, it includes a container of O-ring lubricant. The O-rings, resembling thick rubber bands, are designed to establish watertight seals when going underwater. Manufactured to precision tolerances required to hold a pressure seal on your housing and made of elastomeric material, O-rings provide the means by which watertight seals are formed.
O-Ring care guide.