Reusable bottle-top filter holders, PSF, for thread 33 mm, 500 ml, 1 unit(s)Reusable bottle top filter holders, PSF, for thread 33 mm, 500 ml Material: PSF. Autoclavable: yes. For screwing onto vacuum sealed bottles with 33 mm thread or GL 45. Ideal for vacuum filtration with 47 mm or 50 mm membranes. With graduations. Hose connection for hoses with inner of 6 8 mm. Technical Information Funnel volume 500 ml Thread 33 mm