Original Makita main‑piston O‑ring repair set — part 199165-4 — designed to restore the air seal inside the piston assembly of compatible Makita pneumatic nailers and tackers so the tool stops leaking and returns to consistent firing.
This small multi-piece seal kit contains the piston O‑rings made from a durable elastomer intended for repeated compressed‑air cycles; it’s a genuine Makita replacement that seats into the piston grooves without modification. This is one of the common Makita parts used when a nailer develops weak shots or intermittent firing.
Example compatible models include the DBN600 series (DBN600 / DBN600ZJ 18 V Brad tacker) and the XNB02 series (XNB02RJ, XNB02Z)
Easy to fit during routine piston service: replace the old, flattened or cracked rings with this set to stop air leaks and restore normal drive pressure and nail depth control.
Jump straight to the Makita spare parts diagrams:
