WEBCGEP75TP3. pore size 0.2 μm, cartridge nominal length 5 in. (12.5 cm), Code 7, silicone seal. View Pricing. CGEP73TP3. pore size 0.2 μm, cartridge nominal length 30 in. (75 cm), Code 7, silicone seal. View Pricing. CGEP72TP3. pore size 0.2 μm, cartridge nominal length 20 in. (50 cm), Code 7, silicone seal.