Original Makita O‑Ring 56 — part no. 213655-4. A black rubber sealing O‑ring listed as “O RING 56” for use in Makita tools; it serves as the 56 mm sealing element in piston/cylinder, intake or dust/vacuum assemblies depending on the model.
Fits Makita parts diagrams: HR3850B (rotary hammer), HM1201 / HM1200K / HM1200, and several Makita vacuum models such as VC2510L / VC2211M / VC3210L and VC004GL; Use this original Makita part 213655-4 when your tool shows air or oil leaks, loss of suction, or piston sealing wear.
Simple replacement: swap the worn ring for the Makita 213655-4 in the corresponding groove (nominal size “56”).
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