This collection tank does not have a vacuum pump ~, this shop does not have a vacuum pump for sale, so you need to bring your own vacuum pump. For vacuum diversion, it is recommended to choose a 1.5-liter vacuum pump within 0.5 m2, and a 2-liter vacuum pump from 1 m2 to 2 m2. The size of the vacuum pump depends on the pumping speed, and the relationship between the limit negative pressure is not great! ! !