This is a replacement Pentair Cartridge Gasket.
This item is typically used with the Dynamic Series Chlorine/Bromine Dispenser Model R172540/R172540F; Top Load In Line Cartridge Dynamic Series V Filter Model DSC 75; DSC 100; Dynamic Series I Inline Cartridge Filter Model RDC-25; RDC-25S; RDC-50 and RDC-50S and Dynamic Series II & III Filter Model RTL/RCF
