Trust Tremco 440 Butyl Tape for windows to deliver professional-grade, weather-resistant sealing in residential and commercial projects. This premium black butyl tape (1/8" x 3/8") offers strong, flexible adhesion for windows, doors, and curtain walls while effectively blocking air, moisture, and dust. Its durable, easy-to-apply design ensures reliable performance in glazing and panel systems, making it an essential choice for lasting protection and energy efficiency.