Apeks By Aqua Lung XTX50 Octo Regulator This octopus is based upon the XTX50 second stage It includes left / right reversibility, coldwater capability and the performance you would expect from an Apeks pneumatically balanced valve. Diver-adjustable controls for opening effort and venturi control The unit has a high visibility yellow front cover, yellow accent pieces and a 36 yellow hose Comes standard with small exhaust tee