Poultry nipples are valves which dispense a drip of water whenever they are pecked.
1. Use drill bit size 11/32 at low rpm for PVC, bucket or container with thick plastic wall. For other think plastic like re-used water bottle cap, using drill bit size 5/16 is recommended. 
2. Do not install the chicken nipples at sidewall of bucket or PVC pipe. 
**Need to install them in vertical direction.**
3. Use a little silicone or thread tape and screw nipple into the drilled hole. 
4. Manufacturer recommends 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- 75 psi).
If you want to have it connected directly to a garden hose then a water pressure reguator is required.F

Nipple style waterer had been typically used by professional chicken farmers for many years due to many outstanding reasons. 
No more poop in water. 
No spiling and soaking the nesting material so the chickens can get nature gravity fed by fresh, clean water without dieases. 
More and more backyard chicken farmers come to agree to freely DIY or home made their own nipple waterer system by their chicken numbers. 
Because it is easy and quick to build. 
Save money and save time of looking after chickens. 
Even leave town for the weekend without worrying about the flock. 
Each valve has a 360 degree stainless steel nipple head that will work from any angle. 
Good structure design---removable lower parts for easy cleaning.
Item is easy to install in PVC pipe, a five gallon pail bucket or container.Just simply screw in to your drilled hole. 
No experience necessary. 
Red color design attracts fowl to fnd them fast to use, whether they are a day old or 5 years old. 
Works great for broilers, layers, breeders, pullets, chicks, ducks and other game birds. 

Nipple Details: 
1. Screw in style, screw size: 11/32 
2. With 360 degree stainless steel nipple 
3. Heavy duty 
4. With Removable lower parts for easy cleaning