国产一区二区三区波多野结衣AV_在线观看v片_久久午夜无码免费_婷婷久久国产对白刺激五月99_av不卡国产在线观看_中国一级特黄毛片大片久久

1. Charging limitation function: variable electromagnetic field principle is adopted to prevent aeration of ordinary gun;

2. Self-closing function: turn off the handwheel and do not vent air, only when the pressure reducing valve is installed;

3. Anti-disassembly function: only special disassembly equipment can disassemble Angle valve;

4, electronic label: built-in unique key, achieve a bottle of one yard, can not be mixed and stolen;

5. It can dock with Anbo smart gas platform to realize the management of cylinder traceability.