The Maxitrol 325-7AL210D-1 1¼″ Regulator with OPD & Limiters is a robust gas pressure control device engineered for high-capacity systems. It features an Over-Pressure Device (OPD) and built-in vent limiters to prevent unsafe pressure excursions. Designed for 1¼″ lines, it maintains stable downstream pressure while protecting downstream components. Ideal for commercial HVAC or large a... https://www.partshnc.com/325-7al210d-1-14l-maxitrol-125-reg-w-opd-and-limiters