Model VS-2 Retrievable Casing Packers are full opening, set-down type hook wall packers that are applicable for a wide variety of well treating and producing installations. The packers are available in 7 - 16 OD. casing and feature a large internal bypass through the packer which communicates with a surface controlled set-down face seal type valve. The bypass provides free flow of fluids through the packer during running, retrieving, and circulation, thus greatly reducing packing element swabbing and button slip wicker dulling. These packers are used when high differential pressure from below the packer is anticipated and utilizes hydraulically actuated button type slips to anchor the packer against upward movement. This same hydraulic pressure also acts on a balance piston, which is located just below the closed face seal. The piston moves downward and shoulders on body thus placing a downward pull on the body and face seal. This action eliminates excessive tubing set-down weight required to keep the bypass closed.