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Andersen 939 Narroline Sash Balancer
Match your windows (lower sash) visible glass size (width & height) to the chart Works with Perma-Shield Narroline Double-Hung Windows manufactured from 1968 to Present. Sash balancers are metal boxes that contain a nylon cord under tension. The balancer number is a code for the tension and the cord length. If you replace one balancer you should replace both balancers. Manufacturer Andersen, Part 1, Weight 1.32 pounds, Dimensions 7.44 x 7.09 x 1.22 inches, model number 1, Is Discontinued No, Material Nylon, Quantity 1, Rank Tools & Home Improvement Window Dressing Hardware 128, Available March 5,

Price is $58.00
Price: $58.27