Is it necessarily to have DAP- S Vaccume pump set?

DAP-12S is not necessarily required. Most users provide an air from the piping in a factory.
In addition, you can use any vacuum pump if you can connect the hose attached to the air pit so that there is no air leakage.
DAP-12S set is the product with the equipment attached. If you do not have a vacuum pump or a suction source, we recommend to use DAP- S Vaccume pump set.