Ordering by number: this is 410460050, the Tamco/Toku throttle valve. It governs how air reaches the working end of the rivet buster. Wear on the sealing land is the usual cause of a throttle that leaks with the trigger released.
It appears on the RB 90 91 Rivet Buster and RB 110 Rivet Buster, and on 2 other machines breakdown.
If you need the parts around it, the parts diagram hub has the full breakdown library, and the Tamco/Toku lineup covers the machines themselves. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.
- Part number: 410460050
- Manufacturer: Tamco/Toku
- Crowder SKU: TK-410460050
- Listed on breakdowns for: RB 90 91 Rivet Buster, RB 110 Rivet Buster, RB 91HP Rivet Buster, RB 70 Rivet Buster

