This duct adapter, designed by GMP Tools, is specifically engineered to transition from an 18mm diameter to a 1" SDR (Standard Dimension Ratio), providing a reliable solution for a variety of piping and conduit applications. Crafted to facilitate seamless connections between different pipe sizes, this component is essential for ensuring efficient fluid flow and system integrity in your installation projects. The adapter is sold individually under part number 89434, making it a practical choice for contractors and DIY enthusiasts looking to enhance their piping systems with durable and versatile connections.