Reversible. This 6 Quart Feeder has a large open top, and a solid one piece construction. Durable, UV protected. Back of Feeder is molded to fit over a rail or fence. Comes with a Peach Teat brand nipple (screws into the bucket). This newly designed bucket is made with a teat opening in the front and back of the bucket to allow for it to be hung on the inside or the outside of a fence or rail. A stopper plug is included for the side you are not using. Bottom has small legs so it stands on a flat surface. Inside has a cutout so milk flows to the teat. This feeder is designed & proven to last for years.