Check the listing for details. Sundance Spas Filter Outer Core Only (6473-165). Condition: New. Listed at 72.99 USD. Sundance Spas Cartridge Filter - Outer Core Only6473-165OEM Part 6473-165S | Sundance Spas MicroClean Filter Ultra OuterBrand: Sundance® SpasSKU: 6473-165S6473-165 Sundance® Spas MicroClean® Ultra Filter Exterior OEM Genuine OEM Sundance® Spas factory part. Not an after market.The filter that goes with this outer filter is 6473-164.The complete set up with inner and outer filter is 6541-397. This is the latest filter technology from Sundance Spas.This filter is the exterior pleated portion of a new 2 part MicroClean® filter. Works with inner portion 6473-164 sold separately.Fits the following models:1.880 Series 2009-20232.850 and 880 Series 2005-2008Interchangeable with part number 6540-507 Returns are not accepted on opened or used product. Please make sure that this filter fits your Sundance Spa.An RMA/RGA is required to return all products. Buyer pays return shipping.If you have any questions, please let us know. We would be happy to help.