This Locking Cap (Part #192126) is a replacement component for your Pfeiffer vacuum pump. Its job is to securely fasten and lock certain internal parts in place . Think of it like a specialized nut or retainer. It keeps components from moving or loosening during pump operation. This locking cap is designed specifically for the Pfeiffer UNO 1.5A and DUO 1.5A pump models . If you are rebuilding your pump, you will likely need this part. In fact, it is included in the Minor Repair Kit for these pumps .
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