Stuckey’s model "HB" Hydraulic Single String Packer is designed and built to be used in sour service, as a single packer, lower packer in multiple-packer hook-ups, using dual or triple string packers, or as an upper packer in selective single-string completions. It is set by applying a differential pressure to the tubing at the packer, and released by a straight pull on the tubing or rotating the tubing eight turns to the right at the packer.