Kenmore Single Undersink Drinking Water System —
They can be hard to install because of location, but careful layout so connections can be leak checked before mounting alleviates headaches.
Water tastes absolutely fantastic and teeing to icemaker ensures your ice does not ruin taste.
BUT!!! I've had two of these plastic cartridge holders bust over the years flooding house. This time I will look for one that has a lifetime expectancy (not the cartridge).