I bought the wing a little while ago from someone on the board and it turns out I didn't need it. The description from the Apeks site is below. $150 shipped in the US.
This single cylinder buoyancy cell can mate to the WTX Harness or directly to the back plate.
Gussets along each side allow for a full 32 lbs of lift without compromising the overall size of the WTX34 slots allow it to be mounted to a WTX harness or back plate using and upper and lower nylon cylinder bands2 pairs of grommets allow the WTX3 to be bolted on if a single cylinder mounting kit is usedA 2" wide restriction band at the bottom of the WTX3 allows the cylinder to nestle into the inflated buoyancy cell so it doesn't get pushed away from your bodyA 2" D-ring on the restrictor band is a convenient place to add accessories like a surface marker buoyThe airway comes off the top back center of the cell. A safety cable inside the elliptical hose prevents hyperextension of the corrugated hoseFeatures the Apeks technical inflator with brass buttonsIncludes front, lower left pull dumpConstructed from durable 840-denier nylon
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