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Gravina’s installed a top quality Marvin sliding patio door. The installation was outstanding. The interior and exterior finishes were matched exactly. This is the second patio door we have purchased from Gravinas. The first was several years ago. In both cases , they did an outstanding job. I recommended them to my nephew and they replaced several of his windows which were damaged by hail. He was completely satisfied and has ordered more windows from Gravinas of Littleton. 

Source: www.windowsforyourhome.com