Genuine Bosch part 1615437511 is an oil reservoir and seal kit designed for Bosch rotary‑hammer power tools.

The kit ships with its sealing gasket and 50ML recommended oil that maintains lubrication to the hammer mechanism to prevent wear and ensure consistent performance.

Fits a range of Bosch rotary‑hammer models (examples listed in suppliers’ diagrams include 11240, 11241EVS, 11247, 11248EVS and multiple GBH‑series tools such as GBH 5‑38 D and GBH 5‑40).