The bare swab is made with 2lb foam density. The bare swab is an unaggressive, but useful pig. They are used on many water utility lines for sweeping unwanted build-up and determining the effective internal diameter of pipe. The swab is also used for drying lines after hydrotesting and has proven to be a safe pig to run if the operator is unsure of the condition of his/her pipeline. Bare swabs can also be outfitted with pull ropes to make pig removal easier.