• POP UP LOCATING PIN STOP • This pin stop works with all 48mm tall vacuum cups. • Vacuum operated pin stop to line up multiple parts on yBetter Vacuum Cups flat table. • Part # RPS1048 • This is a vacuum operated pin stop. Line up multiple parts on yBetter Vacuum Cups flat table, press the go button and walk away. This is the perfect compliment to yBetter Vacuum Cups Better Vacuum Cups.