This valve can be used for a small system of 1 to 2 cups or a large system designed to support 1500 quail. Pre-set to provide approximately 8 lb. water pressure to drink cups. Pressure setting is adjustable. Includes 5/16'' and 1/4'' hose barbs and 2ft normal pressure hose with connector. (Tubing not supplied, see #4028, #4080, #4081 and clamps #4010 #4014) For use with cup drinkers. Should not be used with nipple drinkers.