The Speedaire 4ZM08 1/4" NPT 15 CFM 300 PSI Air Regulator is designed to convert high-pressure air to a lower pressure. This air regulator is constructed of aluminum and features a balanced valve for consistent performance. This regulator has a maximum inlet pressure of 300 psi, and is balanced to ensure smooth, efficient performance, and it features a nonrising adjustment knob for precise settings. The body is made of aluminum, and it comes with a 1/8-inch NPT gauge port.