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These products are well engineered and can be installed in seconds. You can quickly replace your ink cartridges for HP DeskJet 3420 and get back to printing in no time. Carefully testing each cartridge is an important step to ensure that the products you order will properly function with your printer and generate consistent and reliable print results you expect. We stand behind our products and guarantee 100% satisfaction with every order. For your convenience, we also provide lifetime customer support so you can shop with confidence.