Genuine Makita rubber sleeve (part number 422044-4) — a direct replacement sleeve used in Makita gas nailers. The part is a black, wear‑resistant rubber collar that seals and cushions internal components to restore reliable firing power and reduce internal wear from vibration.

Designed to replace a worn or cracked sealing sleeve, this component helps stop gas/air leakage and keeps drive performance consistent, which often fixes misfires or weak driving force without other repairs. It installs quickly in the nailer’s nose/chamber assembly and matches the original Makita profile so it seats correctly.

Example models this sleeve is listed for: Makita GN900SE and GN920, and it also appears in GN900/GN420 parts lists. Use these model numbers to confirm fit with your tool before installation.

What you get: one genuine Makita 422044-4 rubber sleeve, manufactured to original Makita specifications for a straightforward replacement and reliable sealing performance.