Ideal for broilers, breeders, layers, pullets, ducks and game birds. Manufacturer recommends 3 birds per nipple. -Does not require a drip cup. -Screw directly into PVC pipe or bucket, or use reducing tees with Teflon tape for round PVC pipe. -360° side-action pin. -Screw/Threaded style, screw size: 5cm -360 degree nipple stainless steel