This has a unique rubber bellow secondary seal, which provides a high degree of axial flexibility to compensate for lack of concentricity of the shaft & misalignment & wear due to thrust movement of the shaft.
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Retailer Of Conical Spring Seal, GENERAL PURPOSE RUBBER BELLOW SEAL, Teflon Bellow Seal, Conical Spring Unbalanced Seal, Single Coil Spring Unbalanced Seal.