This is a 3D printed part that is extremely useful! It gives you a place to store the detergent cup and it will prevent stains on your washer or dryer from a leaking detergent container!
Very easy to install, just slide it over the end of the detergent spout no need to remove the cap. It is tightly pressure fit with small groves to help hold it in place. Fits around a 1.7" spout and holds a 2" cup (Tide bottle in picture)