Andersen Balance Cavity Plug

• Works with 400 Series (TWII) Tilt-Wash Double Hung Windows manufactured from 1996 to Present.
• There are four plugs on each unit, one on each side of the bottom sash and one on each side of the top sash.
• They are installed in the gap between the jamb liner and the sill (Bottom Sash) and in the gap between the jamb liner and the head jamb (Top Sash)