does this work with hp officejet pro 8620 (used all the time, but started having color streaks)?

I don't know about the 8620 but it worked great on my L7650. Getting all of the ink clened out of the funnel when you are finished charging the print head is a problem unless you use a needle on the syringe to back flush the deep columns in the funnel. Good luck. Gene

does this work with hp officejet pro 8610 with streaks and black not showing at all?

I'm no familiar with the 8610 but if the adapter fits the head, it should work OK. Be sure to wear rubber gloves as the process can be a bit messy. The deep wells on the funnel are pesky to clean completely when you are finished.

ASIN	B06Y4SZDHZ
Best Sellers Rank	#255,037 in Office Products ( See Top 100 in Office Products ) #8,769 in Inkjet Printer Ink Cartridges
Customer Reviews	3.7 3.7 out of 5 stars (46)
Date First Available	April 8, 2017
Is Discontinued By Manufacturer	No
Item Weight	2.39 ounces
Manufacturer	Colul

Printers Printhead cleaning kit Printer Head Cleaner Maintenance Repair Repair Tool For HP 940 941 792 789 771 706 88 89 91 73 72 70 38 18 Designijet D5800 L25500 L26100 L26500 L28500

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