The Whatman™ FP025/1 polysulfone in-line filter holder is ideal for microbiological checks and the filtration for particle-free sterile water. They are also recommended for peristaltic pumps and gas sterilization. They are easy to take apart for cleaning or changing filters. These in-line membrane filter holders are fitted with a pressure-resistant filter support. High quality silicone or PTFE seals ensure that the units do not leak. Construction: Polysulfone. Filter Size: 2.5cm. 10/Pack.