Upgrade window performance with our premium window sash balance replacement, designed for both single and double hung sliding windows. Perfectly suited for 16" windows supporting 13–16 lbs, this balance ensures smooth, efficient operation and restores lost lift capacity. Engineered for a precise fit—just match your stamped code (1540 or 15D) and channel length for easy installation. Compatible with older windows, including those with 'winged' balances. Trust Reflect Window & Door for a reliable solution that extends window life and brings effortless functionality back to your home. Sold individually.