The four smaller secondary filters are a separate part (Unicel C-4401)
inspect the small O-ring at the base of the valve seat
eliminating the need for separate push-pull valves on the filter's plumbing connections
The center core is the internal structural assembly that positions and holds the filter cartridges in place inside the tank during filtration
Pentair Part Number L2R Part Name Skimmer Lid Fits Baker Hydro Skimmer Diameter 9-7/8 in
Pentair U-3 Skimmer White w/ White Lid & Frame, 2" Slip with 1-1/2" Slip Reducers, Includes Float and Check Valve, Basket | 08650-1404 Sanitizer Cartridges & Cells The four smaller secondary filtersU 3 SwimQuip In Ground Skimmer, white w white lid & frame, 2 in slip with 1 1 2 in slip reducers. Includes Float and Check Valve, Basket. Our skimmers are engineered and manufactured to the highest standards of precision and quality to minimize installation time and maximize satisfaction. Features and Benefits: Includes: White Lid & Frame, Float And Check Valve, Basket NSF Certified (Only skimmers with float valve assemblies are NSF certified)