OMNIFilter OW30-DC6-S06 Filter Housing Wrench Replacement under sink housing wrench Used for the loosening of filter housing to change cartridges For use on OMNIFilter CBF1, CBF3, SFM2, USM2, OCT2, OT32, RO2000, RO2050 and U30 housings Also fits some Culligan under sink filter systems