No. 133,586 6 @latrns. (Cl. 166-217) This invention relates to well tools and more particularly to a device to be lowered into or removed from a tubing string with the use of conventional wire line suspension systems and to be latched and unlatched at a desired location of a tubing wall recess such as occurs at connecting collars or is formed in a special nipple, mandrel or other unit of a tubing