This wave washer (Part #971425972) is a specialized wavy spring washer used on Leybold Sogevac vacuum pumps. It fits models SV500B, SV630B, SV630BF, SV750B, and SV750BF . The washer applies constant spring force to pre-load bearings, absorb shock, and take up dimensional tolerances. It helps reduce bearing noise, eliminate vibration, and extend the life of your pump
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