Original DeWalt part 49787-00 — small sealing ring (O‑ring) designed for DeWalt mitre‑saw assemblies. This genuine DeWalt ring replaces the worn or damaged seal that secures moving pivots/guards and keeps debris and dust out of the mechanism, restoring smooth operation and alignment.

Practical details: the part is a single elastomer O‑ring sold per piece and fits into the factory groove on the saw’s assembly; it’s a direct, drop‑in replacement specified on DeWalt/DWS780 parts diagrams. Installation is straightforward — remove the cover or retaining clip, pull out the old ring and press the new ring into the same groove.

Example models (as listed in DeWalt parts diagrams and parts lists) that use part 49787-00 include the DWS780 series and several DeWalt mitre‑saw types; this part also appears on compatibility listings for DHS780, DW713, DW715, DW716, DW717, DW718 and related models — check your saw’s exploded parts diagram to confirm the exact location and part number before fitting.

If your saw’s seal is split, flattened or missing, replacing it with this original DeWalt 49787-00 ring will stop ingress of dust and restore correct clearance and pivot action — a small part that prevents larger wear.