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This upper ink tube cover lock is designed for HP Designjet large-format printers, perfectly fitting 500 Plus, 500PS, 800, 800PS, 510, and 510PS models. It replaces OEM part C7769-40041 to hold and protect the ink supply tubing, ensuring stable ink flow and avoiding loose tubes or leakage. Made of durable industrial plastic, it withstands long-term use and is simple to install. Ideal for printer repair shops and daily maintenance.