Neo-Pure Seagull RS-2SG Water Filter Replacement Filter NP-2SG Fits Seagull IV X-2KF, X-2KB as a substitute for the RS-2SG and RS-2SGH cartridges Micron Rating (Nominal) 0.5 m Country of Origin USA Length 8" (20.3 cm) Outer Diameter 3.875 Flow Rate 1.5 gpm