This is the WineEasy Vacuum Press Kit which hooks up to your WineEasy Fermentor when ready to press. After draining some free-run, the pump is hooked up, creating a vacuum in an intermediate carboy, which will then start drawing wine from your Fermentor. This method of pressing is extremely gentle, and has no risk of over-extraction, as the maximum achievable pressure will be that of the atmosphere (~14 psi).