Halcyon Carbon Fiber Single Tank AdapterCarbon Fiber Single Tank Adapter The Halcyon Single Tank Adapter, STA attaches securely to the Halcyon Single Cylinder BC systems. The Carbon Fiber STA is ideal for the traveling diver seeking to reduce luggage weight. The sleek design of this STA allows the BC system to be mated closer to the cylinder versus the stainless steel STA, allowing the diver's cylinder and valve to be closer to them while diving. The Carbon Fiber STA is a great solution for