Genuine Makita 213983-7 — rubber O‑ring, nominal 4 mm size, designed as a direct replacement seal for Makita finishing/orbital sanders.
This small sealing ring restores proper fit and vibration sealing in the sander’s head assembly — ideal when a worn or torn seal is letting dust or motor oil into moving parts. Fits a range of Makita sanders, for example BO3710, BO3711, BO4555, BO4556, BO4566 and BO4557.
A practical spare among power tool parts, the 213983-7 is the original Makita O‑ring 4 used in factory parts lists and service diagrams, so you can replace the damaged seal and get the tool back to proper operation quickly.
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