Brand new check valve. This is an OEM replacement 1/2" brass check valve for Puma Brand Air Compressors. This valve has 1/2" Male NPT threads on the bottom that go into the tank of your compressor, it also features a male flare threaded input on the side for incoming air that measures 5/8" in diameter. There is a 1/8" female NPT port as well for your unloader line. The diameter of all of the threads as well as the size of the valve is pictured above.