Weller Soldering Iron PU81 Tools

Tip Enclosure PU81 Weller Soldering Iron Spare Part PU81 Pipe For Soldering Tip Bit, 
PU 81 Tip Enclosure is a Metal Pipe or Bushing Weller Tools 
Weller WSP80 Soldering Iron Pencil Handle For WSD81 WS81 WSD161. 

Protection: It protects the heating element and other internal components of the soldering iron.

Securing the tip: It holds the soldering tip firmly in place on the iron.