With precise pressure release valve (low pressure), More simply using, Accurate fine-tuning (regulate to 1 bubble/2-3 sec),The bubble gauge with inverse valve. (regulation can be seen),High purity aluminum regulator body, long-lasting durability and dependability, Dual gauge pressure indicators (tank volume and flow pressure / working pressure),Pro-class solenoid valve with 'cool touch' technology keeps the solenoid cool to the touch during operation. The bubble counter with advanced filtration and check valve to protect internal components of regulator.