Description:Features: 16mm Male Thread, 7.5mm exhaust hole diameter, black round shell.Installed in or into the air flow channel of the aerodynamic devices, noise reduction device in the exhaust system.It can be used in noisy equipment, such as blowers, air compressors, boilers, exhaust port, generators, pumps and exhaust ports.Ideal accessories for air compressors, quite easy to install.Used widely on the admitting port of air compressors, can greatly reduce the noise of air intake.This is a great option for reducing the noise of your compressor and is a great replacement option.