The Maxitrol 325-7AL-1 1½″ Line Regulator Certified is a precision gas pressure control device designed to maintain stable fuel pressure for safe, efficient combustion in HVAC systems. It automatically adjusts downstream gas flow to match system demand, ensuring consistent burner performance and protecting components from pressure fluctuations. Used in residential and commercial furna... https://www.partshnc.com/325-7al-1-1-2-maxitrol-line-regulator-certified-for-2-psi-1-5