Whatman 6720-5045 Polydisc TF PTFE In-line Filter 0.45 Micron, 16 psi Maximum Pressure, 700 Flow Rate (Pack of 10): Amazon.co.uk: Business, Industry & Science Select Your Cookie Preferences We use cookies and similar tools to enhance your shopping experience, to provide our services, understand how customers use our services so we can make improvements, and display ads.