12 Pack RF-9999 Faucet Water Filter Replacement for FM3700 FM4000B PFM350V, NSF
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. Easy to Replace: No tools needed.