Original DeWalt N114827 — dynamic O-ring seal, 13 × 3 mm. This genuine DeWalt rubber O‑ring is a precision dynamic seal used inside rotary‑hammer assemblies to retain grease and control airflow around moving pistons and valve components, helping restore impact performance and prevent seepage.

Engineered for rotary hammers, the ring measures 13 mm (inner diameter) by 3 mm (cross‑section) and is made from a durable elastomer suited to the grease and motion conditions found in DeWalt hammers. It’s the exact replacement you want when you see grease leaks, loss of hammer action, or reduced performance after service.

Example DeWalt models this part is specified for include DCH253 (DCH253B / DCH253M2), DCH273 (DCH273B / DCH273P2 / DCH273P2DH), DCH363KL and several DCH143/DCH243/DCH274/DCH364 rotary hammers — check your model’s parts diagram to confirm the same part location.

A straightforward, low‑complexity replacement: remove the worn seal, clean the groove, seat the new 13 × 3 mm N114827 O‑ring and reassemble to restore the tool’s sealing integrity and hammer performance.