brass, with blue nylon filter bracket, the apertures is 1/2inch or 3/4inch. This filter can protect your high-pressure cleaner from the suction of large dirt particles and block the internal filter, causing damage. Provide cleaner water for and prolongs the service life of the machine. Installed between water hoses. There is a heavy design at the bottom of the suction filter, which will not float and can sink directly into the ground. It is very convenient to use. High-pressure cleaner or other equipment used in garden, home to polluted water. Keep your high pressure washer running smoothly with this brass water filter.