GE (G.E.) Genuine OEM WG04A01311 Washer Agitator Spline Support & Shim.
This part works with the following brands: G.E., GE, General Electric, Westinghouse, Monogram, Café, Moffat, Profile, Sears, McClary, Hotpoint, & Kenmore.
This part is also known as washing machine agitator spline support and shim, tub seal.