Aqua Lung Omni Shoulder AssemblyOmni Shoulder Assembly The Omni Shoulder Assembly comes complete with a rail system to accommodate the adjustable sternum strap, pull dump cord for the over the right shoulder overpressure relief pull dump valve attached to your bladder air cell and shoulder D rings for accessory attachment. ModLock connectors easily click into place and are simply unlocked with a small tool such as a key or pen. Comes with assembly instructions.