New vent designed for normal venting requirements of series 406 trailers. Standard pressure of 1 PSIG with full open pressure of 3 PSIG and airflow of 10,417 SCFH. An optional pressure setting of 3 PSIG open and full open pressure of 5 PSIG with 29,000 SCFH airflow is available. Vacuum is set to open at 0.5 PSIG and full open at 1.0 PSIG and 4900 SCFH airflow. Materials used in construction are aluminum with stainless steel and monel internal parts.