This valves can automatically control the water level and achieve low self-complementary water, water full automatic stop. This tool can be widely used in your pools and so on. If you are looking for this tool, come and have a try, it will not let you down. Features: Automatic Water Level Control: This water level control valves can automatically control the water level and achieve low self-complementary water, water full automatic stop. No Need Electricity: This tool no need electricity. when water pressure is more than 0.1kg, it can achieve automatic control of water level. Preferred Material: This valves is made of plastics non toxic environmental protections material, not easy to damage and can provide a long service time. Widely Applications: This tool can be widely used for solar energy, aquarium breeding and other automatic water supplies. Easy to Install: Small size and easy to install, no need too much professional skills to install. Four types available: 1/2 Inch upper water inlet (inner installation), 1/2 Inch side water inlet (inner installation), 1/2 Inch bottom&side water inlets (outer installation), 1/2 Inch upper&bottom water inlets (outer installation). The inner installation valves can be used for normal temperature and high temperature, solar energy can be used for outer installation, outer installation types can also be used for inner installation. You can choose the suitable type according to your needs. Specifications: Material: PA6+stainless steel Pressure ranges: 0.1-10kg Thread: 1/2inch (20mm) Min water pressure: 0.1kg Working temperature: 0-70 Package size: Upper water inlet: 125 * 80 * 60mm / 4.9 * 3.1 * 2.4in Side water inlet: 110 * 88 * 60mm / 4.3 * 3.5 * 2.4in Bottom&side water inlets: 112 * 112 * 61mm / 4.4 * 4.4 * 2.4in Upper&bottom water inlets: 150 * 75 * 61mm / 5.9 * 3.0 * 2.4in Package weight: One water inlet type: 145g / 5.1ounce Two water inlets type: 160g / 5.6ounce Packing list: 1 * Water Level Valves