Original Makita 326401-7 — Valve stem for Makita 18V brad nailers. This is the metal valve stem that sits in the nailer’s cylinder/firing assembly and controls the air flow for each shot; it’s the correct replacement when you see weak firing, intermittent mis‑fires, or air leakage from the piston/valve area.
Direct-fit for Makita DBN500 series brad nailers (DBN500 / DBN500Z and close variants) and the XNB01 family of 18V LXT brad nailers — fits the same pneumatic/valve assemblies used on those models.
Tip: this valve stem is normally replaced together with the nearby cylinder springs, sleeve and seals (for example compression spring 234325-2 and sleeve 454940-8 on the DBN500 parts diagram) to restore consistent firing and sealing. The part is listed as Makita part no. 326401-7 / “VALVE STEM” in the DBN500/XNB01 parts breakdown.
Sold as the original Makita replacement valve stem, ready to drop into the cylinder assembly so you can get your nailer back to full performance.
Jump straight to the Makita spare parts diagrams:
