The WaterSentinel WSK-1 prefilter and postfilter replacement kit are alternative/compatible twin-pack filters for the Sears, Kenmore, or Whirlpool UltraFilter Reverse Osmosis System.
The WSK1 replacement filters are compatible with the following part numbers:
Kenmore / Sears
- UltraFilter 150, 300, 350, 450, 500, 550
- 04238476000
- 38475, 38476, 38570, 38472, 38572, 38475, 38575
Whirlpool
- WHER-12, WHER-18
- WHERF K002-87
- EcoWater carbon block water filters
