This Polycap TC 75 capsule filter device by Whatman is a disposable, dual layer, sterile, polyethersulfone (PES) membrane filtration capsule with a 0. 65/0.45µm pore size and 1/2 inch stepped barb fittings. It provides efficient filtration for critical aqueous solutions. The PES membrane is inherently hydrophilic, has low extractables, is bio-safe, has excellent flow rates, and exhibits low protein binding. Maximum pressure is 60psi (4.1 bar). Fittings: 1/2 inch Stepped Barb. Area, Capsule: 75mm. Pore Size: 0.65/0.45µm. 1/Pack. Whatman #: 6717-7504.