High-pressure regulators with flow control valves, designed to maintain a pressure of 50 psi and provide a variable flow rate within 12 settings when provided with a gaseous oxygen supply from 500 to 2200 psi. New click style flow control. Five Year Warranty. Designed to meet the requirements of HCPCS Code: E1353.High-pressure regulators with flow control valves, designed to maintain a pressure of 50 psi and provide a variable flow rate within 12 settings when provided with a gaseous oxygen supply from 500 to 2200 psi. New click style flow control. Five Year Warranty. Designed to meet the requirements of HCPCS Code: E1353.