This newest "Twin-Lock" type of Nipple is a 360° side-to-side toggle action nipple valve which makes drinking easier than ever before. ***Plus, the two wings at the sides help you to install easier than ever...just hold the two winds and turn it left-right! (Required Adapter) *** The upper metering pin precisely controls the water flow through the valve and this leads to a more sanitary environment. This innovation watering system is 100% reliability, providing for all size birds, and dry & hygiene environment.Installation1. Simply drill a 19/64 inch (7.6mm.) hole in the PVC water pipe2. Glue the Nipple Adapter "C7" onto the PVC water pipe3. Snap-on Nipple Drinker to the Nipple Adapter "C7"- Approximately 5-10 chicks per nipple, and the distance of each one should be about 30-40 cm.Package Include: Nipple Drinkers (5 pieces)Manufactured and distributed by K.V.J. Union Company Limited under the brand M.L.A.