25 mm -stainless steel filter holder for in-line filtration. The G¼ connection threads with density barrel guarantee leak-proof sealing of the hose nipple and the holder without sealing rings. Sterilisation by autoclaving (max. 134 °C) or by dry heat (max. 180 °C). 25 mm -stainless steel filter holder for in-line filtration. The G¼ connection threads with density barrel guarantee leak-proof sealing of the hose nipple and the holder without sealing rings. Sterilisation by autoclaving (max. 134 °C) or by dry heat (max. 180 °C).