7185500 – Rotor Disc
The Rotor & Disc 7185500 fits most 1″ Northstar, Sears Kenmore, Whirlpool, GE softeners.
This part is also a replacement for GE part number WS26X10010.
This Rotor Disc is 4 3/8″ in diameter. (and can not be used as the replacement for the smaller 3 3/8″ disc)
The Rotor Disc should always be replaced if it has scratches or grooves worn into the bottom surface, or if your valve is sticking and won’t move. The rotor disc should always be replaced with the Seal Kit #7185487 or WS35X10020 whenever possible.