Oceanic Delta 4.1 FDX10, Yoke Non Swivel Non DVT Item #: 40.7482.23 UPC #: 020545047384 Manufacturer: Oceanic Condition: New This high performance regulator system pairs the Delta 4 adjustable Oceanic"s easiest breathing second stage with the top of the line FDX10 first stage. Second Stage Introduced in 1989, the Delta has been refined and updated over the years. The latest version, the Delta 4.1, is one of only two Oceanic second stages with AVS the Adjustable Venturi System. This allows the diver to adjust inhalation effort so the second stage won"t freeflow during shore entries or long surface swims. Additionally, the Delta 4.1 has Oceanic"s patented Dynamic Adjustment feature. This lets a diver set breathing resistance. The adjustment only needs to be made once; the Delta 4.1 maintains the setting no matter the depth of the dive. The Delta 4.1"s ABS/Polycarbonate housing and anodized aluminum cover ring are exceptionally tough. They weigh just 6.8 ounces and, along with orthodontic mouthpiece, produce minimal jaw fatigue no matter the length of the dive. First Stage The FDX10 offers a balanced diaphragm and is made of forged marine brass. At 28 ounces, the FDX10 is one of Oceanic"s lightest weight first stages. As is the Delta 4.1, it comes ready to use with air or nitrox mixtures up to 40 percent. Two high pressure and four low pressure ports assure a place for all your necessities and accessories. 2nd-Stage Features: Lightweight ABS/Polycarbonate Housing Anodized Aircraft Aluminum cover Ring AVS and Dynamic Adjustment Feature Compact Design Anatomical Mouthpiece Nitrox Ready 1st-Stage Features: Balanced Diaphragm Design Lightweight 4 Low and 2 High Pressure Ports