6 Pack Faucet Water Filter Replacement for RF-9999 FM3700 FM3800 FM4000B PFM400
Perfect Fit: Compatible with all PUR, PUR PLUS faucet water filter systems (classic, advanced, vertical & horizontal), including FM3700, PFM400H, PFM350V, PFM100B, FM4000B, PFM450S and more. Vertical water filter system: FM3700, FM4000B, FM3700B, FM3333, FM2000B, FM4100B, FM2500V, FM3400B, FM3800, FM3800B and more.