# Thermo Fisher Scientific S702771
– P/N：**S702771**
– Brand：Thermo Fisher Scientific (ARL)
– Original Russian：Сальник = Seal / Vacuum Rotation Duct Seal Assembly
– Type：**Vacuum Rotation Duct Seal K7, for ARL 9800 OES Spectrometer**
– Application：Spare part for ARL9800 direct reading spectrometer vacuum chamber rotary interface, vacuum sealing component
– Material：Composite sealing material + metal housing
– Function：Rotary vacuum seal, maintain vacuum inside optical chamber during grating rotation
– Weight：**Approx. 0.18 kg**
– Feature：OEM spectrometer spare part, precision vacuum seal