Makita 421494-0 — genuine Makita labyrinth rubber ring (listed as "Rubber Ring 19"). This molded, labyrinth‑style rubber seal sits in the bearing/armature area to keep dust out and to help damp vibration between rotating parts, restoring proper sealing and quiet operation.
Common example models that use this part include HR2455 (rotary hammer), DA3010F (angle drill) and several Makita jig‑saw/reciprocating/disc tool such as the 4304 / 4305 and 3707 series — check the parts diagram for your exact model to confirm fit.
Sold as a single genuine Makita replacement, the 421494-0 is a small but important item among power tool parts when you need a reliable dust seal and vibration buffer to bring a Makita tool back to factory form.
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