Apeks WTX-D40 Single Cylinder WingThe WTX and WTX D Series is a selection of harnesses, buoyancy cells and accessories which offer unparalleled versatility due to the modular nature of the whole system. Each component can be configured into a highly technical rig for those trained to push the limits, or scaled down to make a travel friendly set up suitable for any diver. Single cylinder wings, often referred to as donuts, are oval shaped air cells or bladders that are not permanently