Ordering by number: this is S5520, the Tamco/Toku packing nut. It keeps air or oil where it belongs inside the tool. Once it flattens or hardens, the machine loses pressure across the joint and performance falls off gradually rather than all at once.

Crowder’s breakdowns list this part on the SF 2BAR Rammer and SF 1BA Rammer.

Use the full diagram library to work through the rest of the assembly, or the Toku tool catalog if you are pricing a replacement machine. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.

• Part number: S5520
• Manufacturer: Tamco/Toku
• Crowder SKU: TK-S5520
• Listed on breakdowns for: SF 2BAR Rammer, SF 1BA Rammer