Original Makita part 213432-4 — O‑Ring 26 — a rubber piston/seal O‑ring used in Makita demolition hammers and related pneumatic assemblies.
Nominal size: 26 mm (marked "O RING 26"), made as a round-section sealing ring to restore piston and pressure-chamber sealing.
Example fitment: commonly listed for Makita demolition-hammer models such as HM0860C, HM0870C and HM0871C
Sold as a single replacement rubber seal, this original Makita O‑ring is ideal when you need a direct-fit part to repair a leaking or worn piston seal — a small stock item that addresses common hammer seal failures and keeps your tool running like new. (Includes genuine Makita markings where indicated.)
Note: if you need exact placement in your tool’s parts diagram, check the HM‑series breakdown to confirm the O‑ring location before installation.
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