Genuine DeWalt O‑ring — part number 633043‑00. This small rubber sealing ring fits into the inner flange beneath the grinding wheel of DeWalt 115 mm angle grinders; it replaces worn, cracked or flattened O‑rings to stop wheel play, dust ingress and uneven flange seating so the wheel runs true.

Fits many DeWalt small / 115 mm angle‑grinder models — examples include D28110, D28111 , D28113, D28114, D28116, D28117, D28136, D28140, D28065, D28066, the DCG412 , DC411 / DC413KL and DWE46101. Replacement is straightforward (typically under 15 minutes): remove the flange / locknut, swap the old ring for the new one on the inner flange, and reassemble.