To comply with the ANSI Z21.80 Standard for Line Pressure Regulators, installations exceeding 2-psi nominal require a tested and approved over-pressure protection device (OPD) for use with the regulator. The 325 Series is suitable for limited horizontal mounting (less than or equal to 90° from upright). But when using the vent limiting device, the regulator must be mounted in a horizontal upright position. Install the regulator properly with gas flowing as indicated by the arrow on the casting.FEATURES CSA certified for up to 5-psi inlet pressure Over-pressure protection device (OPD) to limit downstream pressure in case of regulator failure Maxitrol OPD approved and tested with the regulator Self-aligning valve with lever action for dead end regulator lockup Optional vent limiter eliminates the need to run vent piping to an outside area BENEFITS Meets new ANSI standard Z21.80 for line pressure regulators - for use on piping systems such as CSST or semi-rigid copper tubing up to 5-psi OPD provides required downstream over-pressure protection for supply pressures in excess of 2-psi Pounds to inches regulator provides precise control from pilot flows to full regulator capacity Meets many utility specifications Gases: Natural, manufactured, mixed, liquified petroleum or LP gas-air mixture. 325-3L48: 1/2'' NPT -- 325-3L with OPD48 factory installed to 5-psi 325-5AL48: 1/2'' & 3/4'' NPT -- 325-5AL with OPD48 installed to 5-psi 325-5AL600: 3/4'' & 1'' NPT -- 325-5AL with OPD600 installed to 5-psi 325-7L210D: 1-1/4'' & 1-1/2'' NPT -- 325-7L with OPD210D installed to 5-psi