What it is: a maintenance ink tank, duplexer assembly, and diverter guide designed for HP OfficeJet Pro x451dn/x451dw/x476dn/x476dw/x551dn/x576dw printers. Compatible with HP 970 and 971 cartridges. Condition: 95% original components. Key benefits: restores reliable automatic duplex printing, maintains consistent ink flow and print quality, and reduces downtime with a straightforward replacement. Built to original specifications for dependable performance in busy environments. Why you need it: worn duplexers or diverter guides can cause misfeeds, paper jams, or uneven duplex prints. Replacing with a nearoriginal part helps sustain fast, doublesided printing and prolongs printer life. Compatibility and performance: matched to the listed HP OfficeJet Pro models and HP 970/971 cartridges, ensuring correct fit, alignment, and longterm reliability in everyday office use. What's included: maintenance ink tank, duplexer assembly, and diverter guide, all designed to work together as a single replacement kit. Practical use scenarios: 1) After multiple duplex jobs, to restore smooth automatic twosided printing in a busy office. 2) During routine refurbishment of aging printers to prevent jams and maintain print quality. 3) For service technicians replacing worn parts on HP OfficeJet Pro x4xx/x5xx series during maintenance visits. installation note: verify exact model compatibility before and follow standard printer service procedures to ensure proper installation.