Description: 【Piston Design】: Utilizes a piston that interacts with external seawater to sense environmental pressure changes, automatically opening or closing to regulate air to the second stage. This ensures rapid response, high sensitivity, and a generally simpler structure 【 Design 】: Features  7/16-20UNF-2B port high pressure port for secure high pressure connections,  delivers consistent  medium pressure output  performance with an output range of 135–145 PSI (9.5–10.2 Bar) 【Note】: Maximum working pressure must not exceed 300 Bar for operation   【High Flow Rate】: Supports an impressive air capacity of 2100 liters per minute for reliable breathing during dives 【Multiple Low Pressure Ports】: Includes four 3/8-24 UNF-2B ports for attaching additional diving accessories with ease 【Material】: Crafted from  stainless steel and brass, this regulator is built to withstand rigorous use   Size Chart: Package Size:16.7cmx14.2cmx7.2cm/6.57inchx5.59inchx2.83inch   Package Includes: 1  Piston First Stage Regulator Note: Please allow slightly errors due to manual measurement and different monitors.