Pentair Filter Air Relief Screen 172855

The Pentair 172855 3/4 inch Air Relief Screen fits the Pentair Nautilus DE Filter, the Nautilus Plus DE Filter, the FNS Polymeric DE Filter, the Seahorse FSH Cartridge Filter and the Seahorse Stainless Steel Cartridge Filters. The 172855 screen is round with a rubber base with the metal screen material attached to the base. There are three different filter air relief screens made by Pentair, this one measure 1 3/4 inches in diameter, 1 1/2 inches in height and the opening size is 3/4 inch.