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The Guiberson Knuckle Joint casing swab is of basically the same design as the knuckle joint tubing swab and offers the same advantages of quick change and versatility. The swab is made of high-strength, heat-treated steel and is individually tested to withstand the heaviest swabbing loads. It is designed for use with Types ‘J’ and ‘JS’ cups or (10) Type ‘V’ cups and two mandrels. Cups may be changed in a matter of seconds, with no tools required.