Part number V532141266 (also referenced as 0532141266) is a high-efficiency exhaust filter (oil mist separator) designed for mid-to-large sized Busch R5 and RA series oil-lubricated rotary vane vacuum pumps. 
Compatibility
This filter is specifically compatible with several models in the Busch range, including:
RA Series: RA 0155 A, RA 0160 D, RA 0202 D, RA 0250 D, and RA 0302 D.
It is used in systems requiring reliable oil-gas separation to maintain clean exhaust air in industrial environments. 
Key Performance Features
Exceptional Filtration: Captures up to 99% of oil particles from the pump's exhaust, preventing oil mist from polluting the workspace.
Coalescing Technology: Uses several layers of ultra-fine filtration material (typically glass fiber) to trap oil mist. These particles coalesce on the interior and are recycled back into the vacuum pump's oil system.
Energy Efficiency: Engineered for low backpressure, which reduces flow resistance and improves the overall energy consumption of the vacuum pump.
Safety & Compliance: Genuine Busch filters are highly conductive to prevent electrostatic discharge and are suitable for use in oxygen-rich or harsh chemical applications.