Leybold Part Number for this product is 72187113. These Leybold compact oil mist eliminator exhaust filters come with the internal filter media installed and are used to capture oil fog, mist, or smoke from the exhaust of oil vacuum pumps. These exhaust filters are air tight to prevent the vacuum pump exhaust vapors from leaking into your laboratory. They have KF25 (NW25) ports for easy connection between your vacuum pump and exhaust line. These filters also have an internal back pressure valve designed to release the element at 7.35 PSI differential pressure for pump safety. They come with a 1/8" NPT oil drain port and are made of steel construction with a white painted finish. These compact oil mist eliminator exhaust filters are designed with seamless drawn housings and no welds to rust or vibrate apart. Each comes with an installed filter media that's easy to replace with a thumbscrew.