Minisart® SRP25 Venting Filter 1757A-----Q, 0.2 µm hydrophobic PTFE. Minisart ® SRP with chemically inert hydrophobic PTFE is suitable for venting as well as harsh solvents with a pH of 1 - 14. Type 1757A with a pore size of 0.2 µm can be used for sterile venting. It has hose barb outlet. Related Products