The MD Building Products 2-1/4 inch x 42 inch foam weather strip for air conditioners is intended for use to seal the gap between window sashes or between a window sash and an air conditioner. The weather strip seals out cold air in winter and hot air in summer and creates a barrier to help keep out drafts and insects. - Use to seal the gap between window sashes or between a window sash and an air conditioner - Seals out cold air in winter and hot air in summer - Helps stop vibrations and noise - Creates a barrier to help keep out drafts and insects - Easy to install - Open-cell polyurethane foam