Frit Only, Sparger, #316 Stainless Steel, 1" Long, 10 Micron Porosity. Replacement part for 3-Port Sparger Assemblies (CLS-1437-F series). 1" Long frit with 10 micron porosity. Our 3-port sparger assemblies are designed for gentle aeration using a 10 micron frit in our vertical side arm (VSA) vessels. The frit is removable for easy cleaning. These assemblies are constructed of 316L stainless steel, electro-polished to a 20Ra finish or better and include a blue polypropylene GL-45 open top cap and white silicone gasket.