1/2" CSA regulator 1/2 psi maximum inlet pressure 3-6" out. Maxitrol's straight-thru-flow (STF) design regulators are non-lockup type regulators for high capacities at low inlet pressures. The cone principle allows gas to flow straight through the regulator without changing directions. As a result, frictional flow resistance is reduced, resulting in a greater capacity. An improved flow pattern provides accurate, sensitive regulation at extremely low-pressure differentials. Typical applications include residential, commercial, and industrial gas-fired appliances and equipment used on low or medium-pressure gas supplies. Suitable for natural, manufactured, mixed gases, liquefied petroleum gases, LP gas-air mixtures, and DIN EN 437 gas families 1, 2, and 3.