Description: NEW IMPROVED - SELF CLEANING CUP WATERING SYSTEM! DESIGN YOUR OWN WATERING SYSTEM - A system with one or two cups or a large system using up to 210 cups. Each DRINK CUP can handle up to 40 BIRDS. INEXPENSIVE PRESSURE REDUCING VALVE can be used for small system of one or two cups or large system to handle up to 1500 birds. DRINK CUP IS THE MOST SANITARY WATERING SYSTEM AVAILABLE - These cups have a spring loaded trigger stem for positive shut off of water. Water flows only when the birds beak is in the cup. No messy wet spots as with nipple drinkers. DESIGNING A SYSTEM - Drink cups remain a source of water at a pressure below 5 lbs. PSI, which is provided by pressure reducing valve, or by gravity tanks (less than 5 feet above drinkers)