DeWalt 1004691-69 — Replacement O‑ring seal (13.4 × 2.4 mm). Precision rubber sealing ring designed to restore the crankshaft / crankcase seal on compatible rotary‑hammer assemblies; listed in parts diagrams as 13.4 mm inner diameter × 2.4 mm cross‑section.

Fits (examples): Black & Decker BPHR323K (Type 1), KD1010K (Type 1), KD1250K (Type 1) and Stanley FME1250 (Type 1) rotary hammers — the same 1004691-69 O‑ring appears on spare‑parts lists for these models.

Why this part helps: this is the small sealing ring that stops air/oil leakage and preserves hammering performance — replace if the original is cracked, flattened or missing. Sold as the single O‑ring replacement specified on the parts diagram; confirm the 13.4 × 2.4 mm groove size on your tool before fitting.