Filter disc for use with 5837 and 5838 adapters. Available in polyethylene (100 micron pore size), and borosilicate glass — Porosity A (145-174 microns), B (70-100 microns), C (25-50 microns), and D (10-20 microns). Sold in packages.
Note: These discs are intended to be removable. However, because of the tight fit, the glass disc may break when being removed.