O-Ring, Tamco/Toku part number S844302, listed at Crowder Supply as TK-S844302. Seals like this one are consumables in a scaler they are cheap, they age with heat and hours, and replacing the whole set during a teardown saves a second strip-down later.
It shows up in the parts breakdown for the SF 0BR Rammer and SF A1L1 Needle Scaler, and on 1 other machine. Check it against the reference number on the diagram first; serial breaks change what fits.
Use the parts diagram hub to work through the rest of the assembly, or the Tamco/Toku lineup if you are pricing a replacement machine. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: S844302
- Manufacturer: Tamco/Toku
- Crowder SKU: TK-S844302
- Listed on breakdowns for: SF 0BR Rammer, SF A1L1 Needle Scaler, SF A1L2 Needle Scaler

