OMS Dive Gear Stainless Steel Single Tank Adapter (STA) Hardware Only Style SSStandard SS Single Tank Adaptor (STA) Hardware Only: Unleash the Power of Versatility Designed for the adventurous diver who frequently switches between single and double tank rigs, the OMS Single tank adapter is the ultimate tool for adaptability. Mount on Any Harness or Backpack Compatible with all OMS harnesses, including the DIR and Comfort II, as well as our IQ backpack. It's even mountable on many metal backplates available in the market today.