This is a tank body O-Ring that is commonly used on the Pentair Sea Horse FSH Cartridge Filter With Fiberglass Tank, and the Pentair FNS Polymeric DE Filter. Specs: Part Type - O-Ring O Reference Number - O-420 Inside Diameter - 19-1/8"id Cross Section - 3/8" Kit - No Application - Category - Filter, Cartridge, Filter, DE Application Manufacturer - PacFab/Pentair Application Model - FNS24, FNS36, FNS48, FNS60, Sea Horse FSH FG Tank Application - Part - Tank Body Manufacturer Part Number - 195008 Special Features - Triangle shaped
