Sterile and Standard Replacement FiltersSterile and Standard Replacement Filters The Dual Membrane Self Locking Filter for Pipet Aids eliminates the possibility of cross contamination due to over pipetting. This unique protective filter which incorporates both 0. 8m hydrophilic and 0. 8m hydrophobic membranes to prevent further use once contaminated by fluid is now available in both sterile and standard modes. Specifications: Mfr. No. 4 000 051 Pipet Aid self locking replacement filters 5