Whats in the box:Stainless Steel Single Tank Adaptor with cam bands
All OMS Back plate / Harness systems can accommodate a single cylinder just by adding Cam Bands. The low profile Single Cylinder Adapter also allows the diver to use a single cylinder with any of the OMS back plate / harness systems but with added stability. The Single Cylinder Adapter includes all hardware, (2) Nylon Cam Bands with Stainless Steel Cam Buckles. Total weight 3.3 lbs