High-flow Muffler made of Zinc-plated Steel, has a 50 mesh, self-cleaning Stainless Steel screen. It is made for heavy-duty use. Because of the design of small holes all around the body of the shell, it exhausts air quietly without restricting the airflow. The maximum pressure is 300 psi and the temperature range is 35ºF to 160ºF. The male NPT threads available are 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2" and 2".