The OSI Quad Clear Max Window Door and Siding Caulk Sealant is a high-quality silyl modified polymer sealant designed for use in windows, doors, and siding. Made in Germany, this 9oz sealant comes in a convenient 2-pack, ensuring you have an ample supply for your projects. With its strong adhesive properties and durability, this product from OSI is perfect for providing a reliable seal to keep out water and noise, while also allowing for easy paintability and smooth finish. Ideal for both residential and commercial applications, this caulking sealant is a must-have for any construction or maintenance project.