The XTX40 regulator includes the innovative Diver Changeable Exhausts technology (DCE) This mechanism allows the diver to switch from a small to a big exhaust tee. Changing the regulator to a left-handed arrangement is quick and easy, and may be done by any APEKS Authorized Service Technician. The XTX40 regulator features a new two-shot high strength plastic front cover, which increases the durability of the demand valve's most vulnerable part. This gives the user the option of using a wider exhaust tee for less bubble interference (essential for underwater photography). At an additional cost, a new swivel hose connection is available to provide a more comfortable fit.