Maxitrol Vent-Limited Line Pressure Regulators (2 PSIG Systems)**VENT LIMITER INCLUDED** Maxitrols 325 L Series are CSA certified (ANSI Z21. 80 CSA 6. 22) for 2 psi inlet pressure, with an outlet pressure range of 7 to 11 inches w. c. Call for propane applications. The L models are for use on 2 psi piping systems such as CSST (corrugated stainless steel), semirigid copper tubing, or steel black iron pipe. The regulators reduce pounds of pressure to a level within the appliance or equipments operating supply