Modular Column Hardware guarantees a high-pressure seal between the tubing and end fitting, as well as a proper seating of the frit. The frit is contained in a cap that slides over the column, forming a leak-free and gap-free seal. All stainless steel modular columns use our exclusive Isobore(tm) internal surface finish. Our columns come in lengths of 3.3cm to 25cm and are available with a Frit 2µm frit porosity.