1. Package contents: You will receive 2 brass 3way air compressor check valves. Each check valve has three connection openings, with external threads designed for hose connections, the air pressure tank, and the compressor piston pump. It effectively prevents backflow of air or gases and ensures efficient operation of the compressed air system. Specifications: Model 20 x 16 x 10 mm. 2. quality material: Our compressor check valves are made of brass, offering pressure resistance, corrosion resistance, performance, and reliability. They provide sealing, withstand temperatures and pressures, and prevent unwanted backflow, making them a good replacement for old or damaged air compressor check valves. They are a good choice for air compressor components. 3. Easy to install: Our air compressor check valves feature threaded connections for quick installation without tools. The removable design allows for convenient interior cleaning and ensures longlasting durability. 4. performance: The check valve effectively prevents backflow in your fluid system and guarantees reliable performance in pneumatic applications. The removable design simplifies cleaning and maintenance, extending the valve's service life.