Usage Tips:DURABLE MATERIAL: This mini float valve is made from PVC (polyvinyl chloride) for corrosion resistance GREAT DESIGN: rubber washer ensures a leak proof kit and leak-free; adjustable arm with over 180 degrees of adjustment range; PVC screw for adjustable arm prevents rust and oxidation VERSATILE: Works great for waterer, humidifier, fountain, aquarium, pond, waterer for chickens/dogs/horses/cattle etc EASY TO USE AND COMPACT SIZE: 1/2" NPT male threaded inlet, just hang on the end of a pipe. Nice and easy solution lazy Product Description: Material: PVC (Polyvinyl Chloride) Plastic Product Size: 9.5 x 2 x 2 inch per float valve Product weight: 0.2 lbs per float valve Feature: This float valve is designed to easily thread into a female fitting threaded 1/2" National Thread (NPT) Same basic principle as your flush toilet - fills tested is below level, stops tested is level. It is perfect for water trough, humidifier, fountain, aquarium, pond, livestock water tanks, etc., saving you a lot of time and effort Package Contents Packing: 2 x Water Float Valves