Hayward CX900G Locking Knob (C751, C900, C1200 series)
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Hayward Locking Knob Part CX900G. This locking knob fits Star Clear Plus cartridge filter models: C751, C900, C1200. Dimensions: Brass stem length: 1-1/2" Description: Black plastic four point star top with brass molded into bottom. 2 grooves in brass, one small on bottom and one larger towards top.