Imperial 24 Ga. Galvanized Increaser, 3 In. x 4 In. is an efficient solution for increasing the diameter of galvanized round perimeter pipes. Designed specifically for use with single-wall pipes, this galvanized increaser allows you to easily and effectively expand the pipe’s diameter, providing greater flexibility in your HVAC or ventilation system setup. The larger end of the increaser is crimped to ensure a secure and leak- connection with the existing pipe, making installation straightforward and reliable. Model Number: GV1418