The present invention provides apparatus and methods for expanding an expandable sand screen in the wellbore and then fracturing the wellbore. Some embodiments of the system 10 comprise a piston 22 and cylinder 24 device 12 having a self-contained power source for the generation of a reduced pressure and for aspirating the site 18. A recess cover is pivotally secured to said front cap for covering said recess. This film functions as a protective film to prevent the generation of corrosion.