Agri-Farm Products 800 Hook-Over Trough. This smaller-sized trough has a 34 qt / 32 L capacity. This allows you to hold a decent amount of food or water so you don’t have to come back to refill it. This feeder has two large hooks on the back which allows it to hang over a fence rail. No hardware is needed for installation as the trough simply rests on the fence rails. It’s easy to lift up and wash out. With this trough being 31.5″ long, it’s more compact so you can fit it in smaller spaces. This 800 Trough has UV protection in order to ensure a long life and durability. It is produced from raw material and additives that are approved for food contact.