UWF9-100-9001 Universal connector assembly for Polaris 180, 280, 380 6-504-00 replacement filter for Polaris 180 280 380 pool cleaner About the blue and red part: the blue and the red are a restriction disc to help limit water flow in case the water pressure from the booster pump is too high for the sweeper Package includes: 1 set of UWF 9- connectors 100-9001, 1 x 6-504-00 Wall Filter Satisfaction Guaranteed: Not made or sold by Polaris, but performs the same as the original. If you are not completely satisfied, you can request a replacement or a refund.