; (ii) the item produced in the United States is of a satisfactory quality; and (iii) includes a list of known manufacturers in the United States from which the item can be obtained. . (b) Sense of Congress It is the sense of Congress that, to build the necessary domestic manufacturing capabilities, port authorities should be permitted to make group or pooled purchases of equipment, also known as piggybacking , in which the post-award use of a contractual document allows multiple port authorities to purchase the same supplies or equipment through the original contractual document.