Check the listing for details. Scubapro X650 Second Stage Scuba Diving Regulator. Condition: Used. Listed at 349.97 USD. Scuba diving shop cleaning out excess inventory, make sure to check back as we will be posting more items regularly. The X650 is an unparalleled regulator for all types of dives and divers. Its features and design prove why this regulator has a corner on the diving market. It has a straight coaxial valve, a wider exhaust valve than others regulators, and requires 20% less effort when exhaling. The secret to the X650 is SCUBAPRO's ingenious idea to put the diaphragm and exhaust valve below the regulator's mouthpiece to reduce the chances of the diver experiencing jaw fatigue. Don't miss out on this used regulator deal! All items sold as is with no implied or express warranties of any kind. No refunds, and as with all diving gear, get it checked by your local dive shop prior to any use.