TH API tubing pumps are heavy-walled, stationary barrel, bottom hold-down pumps recognized by API as a standard design. They are often used in shallow wells that produce more fluid than an insert rod pump can accommodate, yet not enough fluid to make an ESP cost effective. Unlike insert pumps, the working barrel of these pumps is a section of the tubing string, which enables them to displace more fluid than insert pumps. The hold-down is an independent piece that is typically inserted in the assembly prior to field delivery. The traveling assembly is installed on the end of the sucker rod string. Tubing pumps include a mechanism on the bottom end of the traveling assembly to retrieve the hold-down as-sembly should the valve require repair.