About the product
- 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.
- The proper balancer must be used to maintain the lower and upper sash in an open position.
- If you replace one balancer you should replace both balancers.
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