1.Make a hole using 11/32" drill bit at the bottom of PVC, bucket or other containers you find available. 2.For use on thin plastic like re-used water bottle cap, 5/16" drill bit might be more apropriate. 3.Wind some thread tape and then Screw the nipple into the hole.
4.1 nipple for 2-3 birds. 5.Water nipples only work under low pressure ( 5.5 psi or less ). Do not conect directly to a garden hose ( house water pressure is around 30 to 75 psi ). If you want to have it connected directly to a garden hose then a water pressure reguator is required.