Feature

●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.

Description