The Plasson bell chicken nipple drinkers is made from a rugged plastic made to stand the test of time in spite very active activity from chickens. www(dot)livestocktool(dot)com Approximately 10 to 12 of the Plasson bell chicken nipple drinkers are needed to serve 1000 adult chickens. In hot climates, experience shows that you might need 12 to 14 drinkers for 1000 chickens. Adjust drinkers to the proper drinking height, always keeping the drinker lip a little higher than the birdâ??s back. The water pressure can be regulated with the pressure regulator.