Upper stopcocks can be pressurized or lead to nitrogen gas.Funnels feature two 2mm glass stopcocks. Available with coarse or medium porosity. ● Material:Borosilicate Glass ● Color:Clear ● With two 2mm glass stopcocks ● Porosity C:fritted disc diameter 20~35μm ● PorosityM:fritted disc diameter 10~20μm ● Joint size 24/40:24 refers to joint diameter,40 refers to joint height,other specifications and so forth ● For replacement:A3512-2mm Replacement Glass Plug,1:10 Glass Bore;A3525-01 Replacement 2 mm Glass Plug;Replacement Stainless Steel Retention Kit for Glass Stopcocks