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Wide Application: Suitable for automotive cooling pumps, water pumps, and similar mechanical rotary shafts. Size: 12mm shaft mechanical seal ensures precise fit and reliable sealing performance. Model 301-12: Common mechanical seal type used in many water pump and cooling system applications. Leak Prevention: Designed to effectively prevent coolant or water leakage under normal operating pressure. Easy Replacement: Direct replacement for worn shaft seals, helping restore pump efficiency quickly.