This listing is for 1/2" PVC tees for connecting to 1/2" PVC pipe slip to slip on each open ends, this means you slide your PVC pipe directly into the tee giving you the freedom to design your own watering system the way you want it. It accepts all types of drinker cups or screw in nipples that have 1/8" MPT threads. Work great for broilers, breeders, layers, pullets, chicks, ducks, quails, and other game birds