One gauge tells you the pressure to the keg and the other shows how much air is left in your air tank. Nonadjustable “shut down” blows off at 55-65 psi. Has a convenient air shut off switch.
The polycarbonate bonnet is lighter weight and stronger than zinc bonnet regulators and it will not corrode in wet environments. No special tools are required to raise or lower the CO2 pressure. The cap knob simply pulls out so it can be turned to adjust pressure up or down then pushes back in to lock in pressure.