Replacement pre filter sleeves for CAN Lite Carbon Filters.
These filters stop dust and other particles being sucked into the carbon bed and should be replaced regularly.
Sizing
Pre Filters are available in 2 sizes:
3500 for the CAN Lite 3500 10 Inch(250mm) or 12 Inch(315mm).
4500 for the CAN Lite 4500 12 Inch(315mm) or 14 Inch(355mm).