?Compatible models?Interchangeable with PUR RF-9999 faucet water filter replacement; For use with PUR Classic, Advanced and Horizontal Faucet Mounts, including PFM100B, PFM450S, FM-3333, FM-9400B, FM-3700B, FM-2000B, FM-9000B, FM-4000B, FM-4100B, FM-2500V, FM-3400B, PFM350V and More models. This filter is not sourced by or sponsored by PUR. The manufacturer?s name and part number have been used for reference purposes only. Additional Details ------------------------------ Package quantity: 1