1. Oil Mist Filter (also known as: oil mist separator, exhaust filter, exhaust filter element)
Product Description:
Driven by pressure, the oil-gas mixture passes through the filter paper and cotton media of the Busch vacuum pump oil mist separator. The oil is captured, thereby separating the gas from the vacuum pump oil. The filtered vacuum pump oil is recirculated via the oil return line, while the discharged exhaust is oil-free, resulting in a clean, pollution-free output.
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2. Air Filter (also known as air filter element)
Product Description:
Busch vacuum pumps operate with very tight clearances between sliding surfaces. Foreign matter—such as particles or dirt—can damage these surfaces, cause adhesion or blockages, and prevent the pump from functioning correctly. To prevent foreign objects from being drawn into the pump, a filter is required to block their entry. If unfiltered impurities enter the pump, they can clog oil lines and contaminate the lubricating oil; therefore, it is essential to select genuine air filter elements.
Maintenance and Repair: The vacuum pump air filter requires regular cleaning to prevent accumulated impurities from being drawn into the pump, which could cause issues such as pump seizure. Product Image:

3. Oil Filter (also known as an oil strainer)
Product Description:
The oil filter—specifically the vacuum pump oil filter—is a filtration component found on many imported vacuum pump models. Installed on the pump's oil return line, its primary function is to capture contaminants generated within the system or those that have entered it. Consequently, it serves as a crucial filtration device for controlling system contamination levels.
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https://www.btlasfilters.com/showproducts/productid/6489981/cid/594764/replacement-busch-exhaust-filter-532000508btlas/