[PoisonIvy]

It’s cycling to maintain a constant pressure. Kind of like how your thermostat cycles the heat on and off to maintain a constant temperature. That’s what makes the brava pump different from a nursing pump that cycles to make the vacuum pressure rise and drop by a lot, over and over again. An airlock doesn’t maintain constant pressure. The pressure lowers little by little until the domes fall off. I just hope the airlocks can maintain suction for at least 4 hours.

Oh okay. I guess whenever it will arrives I'll have to see if the airlocks will keep the pressure or not.