Package Content: You will receive 4 pieces of air compressor filters with a 3/8 thread diameter of 16 mm. The black full metal material is not easy to damage and lasts longer. 【Noise Reduction】The air compressor muffler is used on the inlet of the air compressor, which can effectively block dust in the moisture and reduce noise. It is an ideal choice for compressor accessories. 【Extend Service Life】 Use the quiet air compressor to improve the efficiency of the air compressor and the longevity. 【Easy to Install】 The air compressor air uses a standard 3/8" thread. You just screw it into the device. Installation is quick and easy. Wide Application: The silencer filter is suitable for oil-free air compressor and can also be used in noisy devices such as fans, air compressors, boilers, exhaust systems, generators, pumps and exhaust fittings. It can reduce the noise during compressor operation.