Adapter features an internal Acme thread and an external pressure-fit taper. Deep die cut provides reliable performance. Easy to install to any Unger® extension pole (sold separately). Adapter Type: Tool Attachment; Connects Devices (From/To): Extension Pole to Attachment; Stem/Thread Type: Standard Thread; For Use With: Unger® ED370, ED450, ED550, ED902, EZ120, EZ250, EZ400,.