3/4" NPT lever acting with OPD, certified line pressure gas regulator with positive dead-end lock-up, vent limiter, 5 psi maximum inlet pressure, 7-11" WC outlet pressure, and 320,000 BTU/hr. maximum capacity. 325‑L Series line pressure regulators with OPDs are for 5 psi piping systems. The regulator reduces pressure within the appliance or equipment's operating supply range. The line regulator is located upstream of equipment already fitted with an appliance regulator. Suitable for natural, manufactured, mixed gases, liquefied petroleum gases, and LP gas-air mixtures.