Relieve air pressure with this air safety valve. With a brass body, silicone O-ring seal, and stainless steel spring, this soft seat valve is designed for standard or low airflow and can withstand pressure of 150 PSI, 136 cubic feet per minute, and it has a 1/4-inch male National Pipe Tapered (NPT) fitting. This valve has a maximum temperature resistance of 400 Degrees F.