Throttle Valve Plunger, Tamco/Toku part number 430160A60, listed at Crowder Supply as TK-430160A60. It governs how air reaches the working end of the rock drill. Wear on the sealing land is the usual cause of a throttle that leaks with the trigger released.
It is called out in the parts diagram for the TJ 20 Rock Drill (RD 40). It comes off the Tamco/Toku TJ-20 Rock Drill. Pull up the diagram and confirm the reference number for your serial before ordering.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram hub. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 430160A60
- Manufacturer: Tamco/Toku
- Crowder SKU: TK-430160A60
- Listed on breakdowns for: TJ 20 Rock Drill (RD 40)

