Clean your compatible HP design jet thoroughly with this HP 91 maintenance cartridge. It fits into your HP DesignJet printer to help you clean the inkjet nozzles efficiently to improve overall device functioning. Because it’s a genuine HP product, it helps to assure trouble-free printing, and it’s ideal for use before heavy print jobs that need to be right first time. When you’re done with this HP 91 maintenance cartridge, take it out, and reuse it again and again. Scroll down the page for full technical specifications.