This is the official Busch O-Ring made of Viton material, sized 24 mm x 3 mm (Part #PL23970115). It is a direct replacement sealing ring used in multiple vacuum pump brands. This O-ring fits Busch Panda WV250B, WV250C, WV500B, WV500C models, as well as Leybold Ruvac WA/WAU series pumps. It creates a tight seal between mating surfaces to prevent leaks.
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