Model Y341 packer is a hydraulic-set, pull-to-release packer used for multiple zone injections. The packer has a double-stage piston design that could apply higher setting forces on elements to enhance the sealing. The packer has a circulation port that enables reverse circulation across the tool to ensure cleanness, which make the tool hard to get stuck. Multiple packers could be used for water injections, in combination with water distributors and hydraulic anchors.