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Mechanical Seal for 12mm, 16mm, 22mm Cartridge Pump Seal for Grondfos Pump Seal. Cartridge Design: Assembled in a cartridge unit for safe and easy replacement. High Pressure Capability: Balanced O-ring seal type suitable for high-pressure applications. Multiple Shaft Sizes: Available for 12mm, 16mm, and 22mm shaft sizes. Durable Materials: Stationary rings in TC or Silicon Carbide; Springs in Steel. Manufacturer Direct: Professional manufacturer based in Hangzhou, China since 2010. Fast Delivery: 5-10 days for stock items, 15-20 days for custom orders.