"\n\n\nScrew on air filter. 1\/4\" NPT tread. Includes washable sponge filter. This filter can be used on any air DIY filtering application. Keeping a filter in place on your 12-volt air compressor prevents damage to the piston or valve plate due to foreign objects (dirt, dust, sand, etc.) entering the piston chamber.\n\n\n\nThis air filter is sold as a replacement part for the model MV-50 air compressor. The filter thread is 1\/4\" NPT."