The RJ Vinyl corner is rigid vinyl corner that can be cut to size and used for new construction and Rain Jacket replacement window installations. The RJ vinyl corner is a corner Flashing designed for flashing corners of the rough opening underneath windows. Flashing corners properly is important to prevent leaks. Corner Flashing should be sealed to rough opening and RJ Eternabond membrane flashing can be used with corner flashing to create a pan flashing for windows. Corner Flashing can be used for vinyl, aluminum, composite, and wood windows.