DURABLE MATERIAL: This mini float valve is made from high quality PVC (polyvinyl chloride) for corrosion resistance GREAT DESIGN: rubber washer ensures a tight and leak-free kit; 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, chicken/dog/horse/cattle waterer, etc EASY TO USE COMPACT SIZE: 1/2 NPT male threaded inlet, just hook onto the end of a pipe. Nice and lazy solution Product description: Material: PVC plastic (polyvinyl chloride) Product size: 9.5 x 2x 2 inches per float valve Product weight: 0.2 lbs per float valve Feature: This float valve is designed to easily screw into a 1/2 National Thread (NPT) female thread fitting 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: 2 x water float valves