Makita part 213475-6 — O‑Ring 34 (genuine Makita replacement). A small, black elastomer sealing ring listed by Makita as "O RING 34" and supplied as a single piece for the pneumatic/valve area of nailers and finish/brad tools.
Why this part matters: it restores the pressure seal in the main valve / cylinder/driver-guide area so the tool stops leaking air and returns to consistent firing. The part appears in Makita parts diagrams and is sold as one O‑ring (qty 1).
Fits (examples): AN451 (roofing air nailer), AN610H and AN620H (coil/construction nailers), DBN500 (18 V brad nailer / DBN500Z/DBN500RTJ variants) and DBN600 (64 mm cordless finish nailer / DBN600ZJ/DBN600RTJ). These Makita models list 213475‑6 as the O‑Ring 34 in their exploded parts diagrams.
Sizing note: Makita designates it as O‑Ring 34 (Makita’s size code); this corresponds to the common 34 mm nominal O‑ring size used for replacement seals.
If you need the exact service location in your model, look for the O‑ring called "O RING 34" in the tool’s parts diagram — this is the original Makita part number 213475‑6 and is the direct replacement listed by Makita.
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