The adapter is designed to be used with the A Series Gooseneck and allow the customer to gain additional reach for larger aquariums. The Adapter can be installed in less than 1 minute to an existing light and A Series Gooseneck combo. The 90 Degree Gooseneck Adapter will allow you to display your lights in a unique way that adds a new level of fit and finish to the already popular A Series Gooseneck.