Andersen® 837 Narroline Sash Balancer by Andersen at N Online Agency. MPN: 1. Hurry! Limited time offer. Offer valid only while supplies last. 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..
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