- Works with Perma-Shield Narroline Double-Hung Window manufactured from 1968 to Present.
- Seals the space between the upper and lower sash.
- Pressure fits into a kerf in the upper sash. (No adhesive required)
- This bulb style replaces all other previous vintages styles of check rail weatherstrip.
- Available in 42-3/4" length and will need to be cut to length to fit. Use old weatherstrip as a pattern to cut new length.