Vintage Aqualung U.S. Divers CO. "Aqua-Master" Double Hose Two Stage Regulator. Items are pre-owned and show signs, of wear, tear, and abuse. Degraded hoses, writing on box, etc. Untested as is would need service and replacement parts (hose, etc.) to work again. Please contact us if you have any questions, concerns, or would like more photos. Item will be shipped requiring signature confirmation. No Exceptions. All pre-owned scuba equipment (including these items) should be checked out/serviced by a certified industry professional before using! Aqualung. Aqua-Lung.