End connector fits our black hose (https://hatchingtime.com/collections/feeders-waterers/products/water-hose-per-foot) . Typically used with our chick brooders (https://hatchingtime.com/collections/chick-brooders-accessories) , grow out pens (https://hatchingtime.com/collections/grow-out-pens) and breeding cages (https://hatchingtime.com/collections/breeding-cage-systems) . You can also use this end connector in your free-range setup. Mix & match the below collection to create your own watering system. View our full collection of drinker systems here (https://hatchingtime.com/collections/feeders-waterers) .