Three-way check valve: Our product is a three-way check valve, the package includes 2 compressor check valves, the size is 45 x 35 x 30mm, each has three connection ports, which can replace the old air compressor check valve. Male thread connection port: This product uses an external thread. Two male thread ports and one female thread port are respectively used for the pipe connection, air pressure tank and compressor piston pump. The valve is equipped with 10, 16 and 20mm threads for a tight connection. High-quality brass: This check valve is made of high-quality copper, strong and durable, has a long service life and is very rust-proof. Excellent workmanship, good corrosion resistance and does not require excessive maintenance. Easy to install and clean: The brass air compressor check valve is installed via a threaded connection, is quick and easy to install and does not require any tools. The detachable design makes the internal cleaning very convenient and more durable. Heavy-duty